Seeed Studio XIAO ESP32-S3 Development Board Supports Wi-Fi & Bluetooth 5.0

SmartElex HC-08 Bluetooth 4.0 BLE Module for Data Transfer The SmartElex HC-08 Bluetooth module is a compact and reliable HC 08 Bluetooth module designed for wireless data communication in embedded projects. It allows devices to exchange data over Bluetooth Low Energy, making it useful for applications that require short-range wireless connectivity with low power consumption. This BLE 4.0 module is ideal for students, makers, educators, engineers, and startups who want to add simple and efficient wireless communication to their electronics projects. The module integrates easily with popular platforms such as Arduino, Raspberry Pi, and ESP32, making it suitable for robotics, IoT devices, automation systems, and rapid prototyping. Its stable BLE communication helps enable applications like wireless sensors, mobile app control, and data logging. With straightforward serial communication and dependable performance, this wireless communication module simplifies the development of Bluetooth-enabled projects. Features: Bluetooth 4.0 BLE module for low-power wireless data transfer Enables simple and stable serial communication over Bluetooth Suitable for short-range wireless connectivity in embedded projects Easy to interface with Arduino, Raspberry Pi, and ESP32 Low power operation ideal for battery-powered applications Useful for IoT, robotics, automation, and wireless control projects

SmartElex TB-03F Bluetooth Module for Smart Lighting The SmartElex TB-03F Bluetooth Module for Smart Lighting is a compact and efficient Bluetooth 5.0 Low Power Module built on the TLSR8253 chipset, specially designed for intelligent lighting control systems. It conforms to BT 5.0 low power Tmall Genie Mesh standards, enabling direct control through Tmall Genie voice commands. Using star network communication and Bluetooth broadcast technology, this Bluetooth Module ensures quick and reliable response even when multiple lighting devices are connected. With low power consumption, minimal latency, and stable short-range wireless communication, the TB-03F is an ideal solution for modern smart lighting and IoT-based automation applications. Features: Tmall Elf can control it directly without using a gateway. SMD-22 Package Six PWM outputs. With on-board antenna, there is no need to create antenna. Brightness (duty cycle) adjustment range: 5%-100%. Factory preset 50% duty cycle for cool and warm hues. PWM output frequency: 1KHz. Supports numerous sleep modes, including deep sleep current as low as 0.4 uA. With a wall switch to switch color temperature. Support secondary development.

7Semi ESP32-DEVKIT-IE ESP32 Development Board WiFi BLE The 7Semi ESP32-DEVKIT-IE is a feature-rich ESP32 WiFi BLE development board built around the powerful ESP32-WROVER-IE module. With its dual-core processor, 8MB Flash memory, and IPEX antenna connector for enhanced RF performance, this board is designed for smooth wireless communication and reliable IoT prototyping. Whether you're building connected devices, experimenting with sensors, or working on automation systems, the DEVKIT-IE gives you the flexibility and performance you need. It offers a breadboard-friendly layout, a CP2102 USB-to-UART bridge for easy programming, and multiple power options including Micro USB, 5V, and 3.3V. Developers can take advantage of the expandable GPIO pins and rich peripheral support (PWM, ADC, DAC, I2C, SPI, I2S, and more), making this board ideal for IoT projects, DIY electronics, and embedded system development. The combination of stable WiFi/BLE connectivity and robust ESP32 performance makes it a dependable choice for hobbyists and professionals alike. Features: Built around the ESP32-WROVER-IE module, offering dual-core processing power and reliable WiFi + Bluetooth connectivity. Includes 8MB Flash memory for more complex programs, data handling, and IoT applications. Equipped with an IPEX antenna connector, delivering improved RF performance and wider wireless range. Provides a CP2102 USB-to-UART bridge for simple, fast programming and debugging. Breadboard-friendly pin layout with extensive GPIO access for sensors, displays, actuators, and custom electronics. Supports multiple power inputs: Micro USB, 5V, or 3.3V, offering flexibility for various project setups. Ideal for beginners and professionals building IoT solutions, automation systems, wearables, and smart devices. Integrated PCB components and onboard buttons (EN & Boot) for smooth firmware upload and development workflows. ESP32 Devkit Pinout Diagram:

SmartElex PB-03 PHY6252(SSOP24) Bluetooth Module The SmartElex PB-03 PHY6252 Bluetooth Module is a compact low-power Bluetooth module designed for easy wireless communication in embedded and IoT projects. It allows users to add Bluetooth connectivity to their devices for data transfer, control, and monitoring without needing complex RF hardware design. This Bluetooth module is ideal for students, hobbyists, educators, and engineers building wireless prototypes, learning app-based control, or developing smart products that require energy-efficient Bluetooth communication. This module is commonly used in IoT systems, automation projects, wireless sensors, robotics, and consumer electronics where reliable Bluetooth connectivity is required. It works smoothly with development platforms like Arduino, Raspberry Pi, and ESP32, enabling quick pairing and integration for testing and deployment. With stable performance and low power consumption, the SmartElex PB-03 module is a practical choice for DIY electronics, classroom learning, and early-stage product development that needs simple and effective Bluetooth communication. Features: Low-power Bluetooth module for wireless data communication Supports easy pairing for app-based control and monitoring Compact design ideal for embedded and space-constrained projects Works with Arduino, Raspberry Pi, ESP32, and other microcontrollers Suitable for IoT devices, wireless sensors, and automation projects Beginner-friendly module for prototyping and product development

7Semi ESP32-C6 Mini Wifi Development Board Qwiic (DC-10116) The 7Semi ESP32-C6 Mini Wifi Development Board Qwiic is a compact and powerful wireless development board built around the modern ESP32-C6 chipset. It brings together fast Wi-Fi connectivity and flexible input/output options in a small Qwiic-compatible form factor, making it easy to use in projects that need smart communication and control. This board supports Wi-Fi 6 and Bluetooth/BLE connectivity, along with plenty of programmable pins for sensors, modules, and other components. With its Qwiic connector, you can plug in compatible accessories without soldering, simplifying prototyping and expanding your project quickly. Whether you’re building IoT devices, smart sensors, or remote controls, this ESP32-C6 board delivers reliable performance and effortless integration. Features: Powered by the ESP32-C6 chipset for modern wireless applications Supports Wi-Fi 6 for faster and more reliable connectivity Built-in Bluetooth / BLE support for short-range communication Qwiic connector for quick, solder-free sensor and module connections Compact form factor ideal for IoT and embedded projects Multiple GPIO pins for connecting sensors, actuators, and displays Compatible with popular development environments and libraries Suitable for smart devices, automation, and prototyping Pinouts

SmartElex Ebyte E73-2G4M04S1AX Bluetooth Wireless Module The SmartElex Ebyte E73-2G4M04S1AX Bluetooth Wireless Module is a compact BLE module based on the Nordic nRF52810 chipset, designed to add Bluetooth connectivity to embedded and IoT projects. It enables reliable wireless communication for data transfer, device control, and sensor monitoring without complex RF design, making it suitable for students, makers, educators, engineers, and startups working on Bluetooth-enabled systems. This Bluetooth module offers an accessible way to prototype smart devices, wearable tech, and automation solutions where low power consumption and stable connectivity are important. This nRF52810 module is ideal for IoT applications, robotics control, wireless sensor networks, BLE beacons, home automation systems, and smart consumer electronics. It integrates smoothly with development platforms like Arduino, Raspberry Pi, ESP32, and various microcontroller environments, allowing quick setup and easy firmware development. With dependable BLE communication and beginner-friendly integration, the SmartElex Ebyte E73-2G4M04S1AX module is a strong choice for prototyping, academic learning, and early product development where Bluetooth 4.2/5.0/5.2 compatibility and low power operation are essential. Features: Bluetooth module based on Nordic nRF52810 for stable BLE communication Supports Bluetooth 4.2 / 5.0 / 5.2 for wide device compatibility Low-power operation ideal for battery-powered and wearable devices Compact breakout board for easy integration into embedded projects Works with Arduino, Raspberry Pi, ESP32, and other microcontrollers Suitable for IoT systems, BLE beacons, automation, and wireless sensors

7Semi ESP32-DEVKIT-E – ESP32 WiFi BLE Development Board with CP2102 USB-UART The 7Semi ESP32-DEVKIT-E is a compact and powerful development board built around the ESP32-WROOM-32E module, offering dual-core processing, onboard WiFi, and Bluetooth connectivity. Designed for makers, students, and IoT developers, it provides reliable wireless performance and plenty of GPIO pins to interface with sensors, displays, motors, and more. Whether you're experimenting with automation, creating smart devices, or building connected prototypes, this board gives you the flexibility and power needed to push your ideas further. With a CP2102 USB-to-UART bridge for easy programming, breadboard-friendly spacing, and multiple power input options (USB, 5V, or 3.3V), the ESP32-DEVKIT-E is built for smooth prototyping. It delivers a stable development experience with 4MB Flash, a PCB antenna, and support for protocols like SPI, I2C, I2S, ADC, DAC, and PWM - making it ideal for IoT, robotics, wearables, smart home projects, and low-power connected applications. Features: Powered by the ESP32-WROOM-32E module featuring a dual-core processor running at 160MHz for fast and efficient performance. Integrated WiFi and Bluetooth support enables seamless wireless connectivity for IoT and smart device applications. Includes multiple GPIO pins that allow easy interfacing with sensors, displays, motors, and other electronic components. Breadboard-friendly pin layout ensures easy prototyping and smooth development workflows. Equipped with a CP2102 USB-UART bridge for convenient programming and debugging via USB. Flexible power options including Micro USB, 5V, and 3.3V inputs to suit a wide variety of project needs. Built-in PCB antenna, 4MB flash memory, and compact, cost-effective design ideal for beginners and advanced developers alike. ESP32 Devkit Pinout Diagram:

Seeed Studio XIAO ESP32S3 Sense – Wi-Fi, BLE & AI Camera Board If you want a small but powerful development board, pick the Seeed Studio XIAO ESP32S3 Sense. It is ideal for IoT and embedded machine-learning projects. This seeed studio ESP32 board has a powerful Xtensa processor ESP32-S3R8 SoC that provides dependable 2.4GHz Wi-Fi and Bluetooth BLE 5.0. It has an OV3660 smart camera sensor board for crisp 1600*1200 quality photos and a built-in digital microphone for voice detection and audio recognition. You'll love the 8MB PSRAM and 8MB FLASH, plus an SD card slot for up to 32GB of extra storage. It supports battery charging, making it great for portable projects, and it’s versatile with its wide range of interfaces. The XIAO ESP32S3 Sense also offers pre-trained AI models and no-code deployment through SenseCraft AI. Despite its powerful features, it maintains the classic thumb-sized form factor of the XIAO family. This board is a fantastic choice for your next project! Features: Features a powerful ESP32S3 32-bit dual-core processor. It supports Arduino and MicroPython. Includes a detachable OV3660 camera for 1600*1200 resolution. Includes an integrated digital microphone. Measuring just 21 x 17.5mm. Has 8MB PSRAM, 8MB FLASH, and an SD card slot for up to 32GB of memory. Supports 2.4GHz Wi-Fi and BLE with a 100m+ range using a U.FL antenna. Provides pre-trained AI models from SenseCraft AI for no-code deployment. Camera & ML Demo: Sample Projects DIY Face Detection Camera : Use the XIAO ESP32S3 Sense built-in camera and on-board ML support to detect faces, capture snapshots, and send alerts over WiFi. Smart Door Entry Monitor : Combine the camera with a PIR sensor to capture entry events, log timestamps, and stream snapshots to a dashboard. Voice and Camera Surveillance : Use the digital microphone and camera together to detect sound and motion, then record short clips or trigger notifications. Object Classification Station : Run small image classification models on the S3 Sense to identify objects on a workbench or conveyor belt and log results to local storage or the cloud. Portable Field Camera Node : Deploy the board with battery power and SD storage to capture and store images in remote locations for later analysis. Comparison: C3 vs S3 Sense Feature XIAO ESP32-C3 XIAO ESP32S3 Sense Processor ESP32-C3 single core, up to 160 MHz ESP32-S3 dual core, up to 240 MHz Memory Lower flash and no PSRAM on most variants Includes PSRAM and larger flash, microSD support on some SKUs Camera No built-in camera Built-in OV camera module and digital microphone On-device ML Limited for tiny models Better suited for vision and audio ML tasks Ideal Use Cases Low power IoT nodes, BLE peripherals, simple sensors AI camera projects, voice and vision prototypes, edge ML demos Form Factor XIAO compact size XIAO compact size with camera and sensor additions Related Products & Modules XIAO Series Collection IoT Sensors Collection Tutorial : Build a DIY Face Detection Camera Use the XIAO ESP32S3 Sense, attach power and optional microSD card, flash a sample face detection sketch using Arduino or MicroPython, and configure WiFi to stream or upload detection events to your dashboard. For best results use lightweight models optimized for the S3 Sense and test in varied lighting conditions. Suggested steps: Prepare hardware: XIAO ESP32S3 Sense, power source, optional microSD, and a PIR sensor if needed. Install toolchain: Arduino IDE or MicroPython firmware and required libraries for camera and ML inference. Load sample code: run a face detection example, adjust model thresholds and frame size for performance. Configure output: save snapshots to microSD or push events to a dashboard via MQTT or HTTP. Test and tune: iterate on model size, resolution, and detection thresholds for reliable results. Application: Speech recognition Video monitoring Wearable devices Image processing Smart homes Low-power (LP) networking Rapid prototyping Health monitoring Education

Seeed Studio XIAO RP2040 Development Board Supports Arduino, MicroPython, and CircuitPython The Seeed Studio XIAO RP2040 Development Board is a compact, powerful, and versatile development board based on the Raspberry Pi RP2040 chip. As the smallest Raspberry Pi Pico variant, it offers a thumb-sized surface-mount design, making it perfect for space-constrained projects. This development board supports multiple programming environments, including Arduino, MicroPython, and CircuitPython, providing great flexibility for developers, hobbyists, and educators. Its compatibility with various programming languages such as C, Python, Go, and Rust, combined with a wide selection of available libraries, makes the XIAO RP2040 an excellent cost-effective choice for beginners and professionals learning coding and electronics basics. Features: Perfect Toolkit for Learning Coding and Electronics XIAO RP2040 provides a comprehensive development ecosystem that makes coding easy for newcomers while also giving powerful tools for expert developers. Use the Arduino IDE for speedy prototyping, the C/C++ SDK for peak performance, MicroPython/CircuitPython for quick scripting, or Rust and Go for modern applications. With thorough documentation and an active Raspberry Pi community, you'll find plenty of examples and tools to help you get started on your projects. The board includes a 3-color User LED and an RGB LED, allowing you to add visual indications or beautiful light effects to improve functionality and creativity. Classic form factor and extensive Seeed Studio XIAO ecosystem. XIAO RP2040, released in 2021, features the typical XIAO small shape of 21 x 17.8mm. Its native compatibility with the extensive XIAO Add-on ecosystem, which includes expansion boards, sensors, and displays as well as connectivity modules and actuators (Grove Expansion, CAN-Bus, LoRa module, LED Matrix, Vision AI Sensor, Round Display, L76K GSP module, 2-Mic Array, ePaper Displays, mmWave sensor, AC relay, Bus Servo Driver, and many others), makes it suitable for any project, no matter how simple or complex. Production-Ready Design with FREE PCBA Support All Seeed Studio XIAO development boards include a production-optimized SMD (Surface Mount Device) design with standardized stamp holes, making them ideal for commercial PCBA integration. Through our Fusion PCBA Sponsorship program, you can not only get the lowest unit prices for all XIAO modules from our Fusion Open Parts Library, but you can also fabricate and scale your XIAO-based PCBA designs at a low cost (30% off) with FREE Design for Manufacturing consulting services, streamlining the process from prototype to production. Hardware Overview: Top Board Bottom Board Pinout Diagram of XIAO RP2040 Applications: Learning & Education - Arduino, MicroPython, CircuitPython, TinyGo, Rust, and embedded system fundamentals USB HID devices - Include custom keyboards, stream decks, arcade controllers, and MIDI interfaces. Wearable projects - Smart accessories, LED garments, wrist devices, and sensor wearables. IoT and sensors - Environmental monitoring, smart house panels, weather stations, and MQTT. Display projects - LED matrices, POV displays, and rotating LED spheres. Development - Rapid prototyping, hardware testing, and PCB validation. Robotics - Basic motor control, sensor integration, and automation. Audio/Video - Sound processing, media controls, and visualizations.

Seeeduino XIAO compatible with Arduino Seeeduino XIAO is the smallest Arduino compatible board in Seeeduino Family. It is an Arduino microcontroller that is embedded with the SAMD21 microchip. The interfaces of Seeeduino XIAO is rich enough in such a tiny Dev. Seeeduino XIAO is integrated with the powerful CPU-ARM® Cortex®-M0+(SAMD21G18) which is a low-power Arduino microcontroller. On the other hand, this little board has good performance in processing but needs less power. As a matter of fact, it is designed in a tiny size and can be used for Arduino wearable devices and small projects. Applications of Seeeduino XIAO: Wearable devices Rapid prototyping (directly attached to the expanded PCB as a minimal system) Perfect for all the projects need mini Arduino DIY keyboard USB development (USB to multi-channel TTL/USB host mode, etc.) A scenario where you need to read multiple mock values The Digital to Analog Converter output

Seeed Studio Seeeduino XIAO SAMD21 Arduino Compatible Board The Seeeduino XIAO SAMD21 is a compact yet powerful Arduino-compatible board built on the Microchip SAMD21G18 MCU. As the flagship of the Seeeduino XIAO series, this tiny board delivers professional-grade performance in a minimalist, SMD-designed form factor, making it perfect for space-constrained projects. It offers seamless compatibility with Arduino IDE, MicroPython, and PlatformIO, allowing flexible development for a wide range of applications. With extensive tutorials and learning resources, the Seeeduino XIAO SAMD21 is an excellent choice for beginners and hobbyists eager to explore open-source electronics. Features: Ultra-compact Seeeduino XIAO design Powered by SAMD21G18 MCU Arduino IDE, MicroPython & PlatformIO compatible Thumb-sized SMD package for space-saving projects Beginner-friendly with tutorials and learning resources Applications: Learning and Education (Arduino, MicroPython, Basic electronics, and prototyping) Wearable devices include health monitoring, interactive apparel, and tiny fitness trackers. IoT and sensor projects include environmental monitoring, data collection devices, smart home sensors, and small automation systems. Space-Constrained Mini Arduino Projects Rapid prototyping (fast proof-of-concept constructions, hardware testing, product prototypes, embedded system development) HID devices (do-it-yourself keyboard, USB to multi-channel TTL/USB host mode, Seeeduino XIAO SAMD21 Pinout Diagram

Seeed Studio XIAO ESP32-C6 Development Board Supports Wi-Fi 6, BLE 5.0, Zigbee & Thread The Seeed Studio XIAO ESP32-C6 development board is a powerful yet compact solution for modern IoT and smart home projects. Built on Espressif’s ESP32-C6 MCU, it supports advanced wireless connectivity including Wi-Fi 6, Bluetooth 5.0, Zigbee, and Thread, making it highly versatile for Matter-compliant applications. With its thumb-sized footprint and single-sided mount design, the board is ideal for space-constrained projects while still delivering strong performance. Integrated chip-level encryption ensures secure operation, while seamless compatibility with popular IoT cloud platforms enables developers to bring products to market faster. This ESP32 development board is a reliable choice for innovators looking to create next-generation connected devices. Features: Enhanced Connectivity: Includes 2.4GHz Wi-Fi 6 (802.11ax), Bluetooth 5 (LE), and IEEE 802.15.4 radio connectivity, allowing you to use the Thread and Zigbee protocols. Matter Native: Supports constructing Matter-compliant smart home projects through better connection and interoperability. Security Encrypted on Chip: Powered by ESP32-C6, it delivers increased encrypted-on-chip security to your smart home projects through secure boot, encryption, and Trusted Execution Environment (TEE). Outstanding radiofrequency performance: Has an on-board antenna with up to 80m of BLE/Wi-Fi range, while reserving an interface for external UFL antenna. Power Consumption: Offers four working modes, including deep sleep mode at 15 μA, and supports lithium battery charge management. Dual RISC-V Processors: Includes two 32-bit RISC-V processors, the high-performance CPU running up to 160 MHz, and the low-power processor clocking up to 20 MHz. Classic XIAO Designs: Retains the classic XIAO designs of the thumb-size form factor of 21 x 17.8mm and single-sided mount, making it ideal for space-limited projects such as wearables. Integration with popular cloud platforms: ESP Rain Maker, AWS IoT, Microsoft Azure, and Google Cloud. Applications: Secure and connected smart home that improves everyday living with automation, remote control, and more. Space-limited and battery-powered wearables, thanks to their small size and low power consumption Wireless IoT scenarios enable speedy, reliable data delivery. Seeed Studio XIAO ESP32-C6 Development Board Pinout Diagram

LED Driver Board for XIAO Supports 5V and 12V LED Strips -Seeed Studio The LED Driver Board for XIAO by Seeed Studio is a versatile and compact solution designed for driving 5V and 12V LED strips, including popular addressable RGB LEDs like NeoPixel WS2812, WS2813, and WS2815. This LED driver board seamlessly integrates with all XIAO boards, providing smart lighting control and automation when paired with XIAO ESP32 Series using WLED and Home Assistant. It offers flexible power supply options, making it ideal for a wide range of lighting projects. Additionally, the board comes with comprehensive protection features, ensuring safe and reliable operation in home automation and creative lighting setups. Features: Wide LED Compatibility: The driver is versatile and can support both 5V/3A and 12V/2A LED strips. It also has integrated power regulation. Compatible with single-color and addressable RGB LEDs, including NeoPixel WS2811, WS2812(B), WS2813, WS2815, SK6812, and other 1-wire protocol LEDs, giving a wide range of lighting options. XIAO Compatibility for Smart Control: Designed to fit all Seeed Studio XIAO boards. When linked with the XIAO ESP32 Series (ESP32-C3/S3/C6), unlock smart features via WLED app support - Control colors, effects, brightness, and create creative animations (XIAO ESP32C3 comes strongly recommended). Home Assistant connection with ESP Home enables remote control, automation, and smart home scenarios. Grove Ecosystem Compatibility: The onboard Grove interface is compatible with over 400 Seeed Studio modules, such as infrared sensors, temperature sensors, accelerometers, and others, allowing you to easily improve lighting interactivity with the surroundings and motion for smarter, more personalized effects. Flexible Power Input: Supports 12V/2A power via a normal DC adapter (EU/US plugs) or direct DC wiring, with a universal 5.5mm x 2.1mm DC Barrel Jack connector. Suitable for temporary and permanent installations. Compact form factor: The space-efficient design enables for inconspicuous installation alongside LED strips or in tight places, making it appropriate for a variety of lighting applications while preserving full functioning. Comprehensive Protection: Overcurrent, overvoltage, overtemperature, and short-circuit protection are integrated to ensure reliable operation and component longevity. Hardware Overview: Applications: Home Lighting & Decoration: RGB strip lights, wall lights, and holiday decorations Educational and Science Experiments: Coding and Microcontroller Education, LED Light Design, Physical Data Visualization Gaming and interactive installations: PC case illumination, around-screen LED effects, interactive LED floor or wall. DIY Projects and Fun Uses: LED name boards, LED clocks, DJ disco lights, RGB mood lighting.

WeMos Lolin V1.0 wifi+Bluetooth This is WeMos LOLIN32 board which is based on ESP 32 Rev1 Wifi and Bluetooth Board. The WeMosboard is designed perfectly for DIY wifi-based projects compatible with Arduino. This WeMos Lolin wifi board is inspired by Adafruit’s Feather series. It has 4 MB flash memory onboard, a USB-serial adapter (cp210x), and a LiPo battery charger and connector. All the relevant pins are broken out and well-labelled, especially on the bottom. It has a nice central reset button and even a single-user LED for your blinking pleasure. Pinout: Pinout of WeMos Lolin V1.0 wifi+Bluetooth Applications: Wireless Communications IoT Applications Control System Home A utomation

0.9V-5V to 5V DC-DC USB Step Up Power Boost Converter Module The USB converter modules produce an output of 5V and feature an LED indicator. It can be used in various applications like mobile phone, pad, GPS, automobile data recorder and Bluetooth device. Step-up Module with 0.9-5V input, output 5V for many digital devices, so this is really a great module for designing a portable charger. Useful for your USB charger projects and onboard USB device supply solutions. (ie GoPro cameras) You can supply it with single-cell LiPO or an AA size battery or others. Two AA batteries can output a current of 500 ~ 600MA, a single AA battery power supply can output 200ma current supply, great for mobile phones camera, single-chip, and digital products supply. check out : 0.9V-5V to 5V 600MA USB Output charger step up Mini DC-DC Boost Converter Applications: USB voltage regulator for USB-powered device. This module will bring the USB voltage required for your application at regulated 5V output. Various USB devices need 5V from low voltage batteries. Charge mobile phone/MP4/MP3 from AA battery when traveling