Ultrasonic distance measurement and obstacle avoidance, automatically rotate or retreat to avoid obstacles. The digital tube displays the current obstacle distance in real time, up to 5 meters. The introduction of a simulation design concept makes the circuit board more like a car chassis, and the dedicated motor driver chip controls the motor forward and reverse rotation, and flexibly controls the car's forward, backward, and in-situ rotation. The STC single-chip control system is more convenient to use. Colour:Green Material:plastic Package Contents: 1 x Ultrasonic Ranging Obstacle Avoidance Kit 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.