1. The main control board uses the CH340 development board. 2. The motor driver module uses the typical L298N module to drive the DC motor. 3. The infrared signal detection module uses four pairs of infrared light to detect the black line to achieve the tracking function. 4. The ultrasonic sensor module uses the HC-SR04 module, which measures the distance and realizes the ultrasonic obstacle avoidance function. 5. The combination of ultrasonic and two infrared detection modules realizes the vehicle following function. Power supply: 2 removable 18650 lithium batteries (Batteries not inculded) NOTE: This robot is without batteries, and the battery type is 18650 3.7v, with no capacity limit. Different batches; different components or colors, but it does not affect the use Colour:Black Material:Plastic + Metal + Electronic Components Package Contents: 1 x Smart Robot Car Coding Kit (the kit is not a finished product and needs to be assembled by yourself) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.