Using the Micro:bit 4WD Mecanum Robot Car V2.0 is a breeze. First, make sure to insert two 18650 lithium batteries to power it up. Then, connect it to your Micro:bit board (not included) via Bluetooth or infrared, depending on your preference. You can start coding to control the car's movements, like servo control for steering, or use the ultrasonic following feature to make it follow objects. For music, the passive buzzer can play the tunes you program. When using the lights, the 4 WS2812 RGB LEDs can show different colors, and the 2 seven - color lights act as directional indicators. As for the line tracking function, place the car on a suitable surface with marked lines. Important note: Since the Micro:bit board is not included, you need to have one ready to use the car fully. When it comes to maintenance, keep the car clean from dust and debris, especially around the sensors. If you're not using it for a long time, remove the batteries to prevent leakage. With proper use and care, this robot car will provide you with endless coding and robotics enjoyment.