Item Type: Smart Robot Car Chassis Kit Material: PCB Power Supply: 4 x AA battery(not included) 1、EASY INSTALLATION: Smart robot car come with simple mechanical structure, very convenient installation 2、A VARIETY OF SYSTEMS: The car comes with 20 lines of tachometer code, with photoelectric gun shop can quickly form a gun system. Can be composed of speed, distance, closed loop system 3、POWER SUPPLY AND SWITCH: Smart car is equipped with 4 battery compartments to facilitate the power supply of the whole system. At the same time with a switch, easy to start and stop the system 4、GOOD INTEGRATION: No need for additional tools, very convenient, make the whole system highly integrated 5、RELIABLE PCB: Adopt excellent PCB materials, with reliability and miniaturization, good maintenance and interchangeability 1 x Car Chassis 2 x Wheel 2 x Motor 1 x R3 Motherboard 1 x V5.0 Expansion Module 1 x L298N Driver 1 x SG90 Module 1 x SR04 Ultrasonic Module 1 x USB Cable 1 x User Manual 1 x Battery Case 1 x Caster 4 x Bracket Fittings 1 x Module with Line Row 4 x Connecting Wires 1 x No. 1 Screw Pack(4 x long screws, 4 x medium flat screws, 5 x medium tip screws, 7 x short screws, 6 x nuts) 1 x No. 2 Screw Pack (3 x accessory holder, 2 x medium screws, 1 x short screws) 1 x No. 3 Screw Pack (4 x long fitting, 2 x round fitting, 1 x switch, 4 x long screws, 10 x short screws, 6 x nuts, 4 x bolts)