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. 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. Bluetooth wireless communication modues (short-range wireless remote control) Multi-function 4WD Robot Car Kit comes with economic and environmentally-friendly rechargeable battery and charger(battery not included) Multi-function 4WD Robot Car Kit can be equipped with a variety of sensor modules, depending on your imagination to achieve a variety of functions Package Included: 4 x Geared motor 4 x Tyre 4 x Motor fixing 2 x Acrylic glass plate(100 x 213 x 5mm) 1 x L298N motor driver 1 x UNO328 controller board 1 x Sensor board V5 1 x Holder kit 1 x Steering gear 1 x Ultrasonic module 3 x Line inductive module 1 x Infrared receiver module 1 x MCU remote control 1 x 18650 battery holder 2 x 18650 battery 1 x 18650 battery charger 1 x Bluetooth adapter 1 x USB cable(0.5m) 30 x Dupont line 15 x Pillars(6 x 35mm / 3 x 20mm / 6 x 6mm) All necessary screws and nut