The Multi-function 4WD Robot Car Kit is an upgraded version of the auto-walk car, which added the part of Bluetooth control. The Multi-function 4WD Robot Car Kit is a microcontroller learning application development system, based on AtMega-328p. Multi-function 4WD Robot Car Kit has the function of hunting, obstacle avoidance and remote control. And also expands external modules to increase the car's function. Specifications: Working Voltage: 7V - 12V Decelerate Motors Ratio 1:48 Motor Drive Voltage 6V Features: Uses L298N driver module, real isolation to MCU Three groups of hunt modules (detects black and white lines), higher accuracy The infrared remote communication module, composed of the smart car is a remote control system.