DIY 2WD Smart Chassis Car Kit Simple Structure, easy to assemble and use, reasonable design, reserve interface for tracking module. speed module, driver module, and obstacle avoidance module Four on the 5th battery compartment, convenient power throughout the system in a switch, while starting and stopping. Using a high-quality magnetic motor through EMC testing, decelerate ratio of 1:48. This kit comes with Round shape chassis, Motors, wheels, and all required assembly parts to build a complete robot car. Package Includes: 1 x DIY 2WD Smart Chassis Car Kit Specifications:  Round Plate Diameter 135 mm Square Plate Size 135×90 mm Wheel Size (D x W) mm 65 x 25 grip Motor Type Dual shaft-Straight, BO motor Motor Operating Voltage 3 to 6V DC Motor Rated RPM No Load Speed (3V) 90RPM +-10% Motor Gear reduction Ratio 1:48 Motor Rated Current No Load Current (3V) Less Than 150mA Chassis Material & Color Acrylic Transparent Wheel Material Plastic with Rubber tyre