1. Using high-quality materials, the quality is guaranteed 2. Ultrasonic distance measurement and obstacle avoidance, automatically rotate or back to avoid obstacles when encountering obstacles 3. The digital tube displays the current obstacle distance in real time, up to 5 meters 4. Introduce a simulation design concept to make the circuit board more like a car chassis, a dedicated motor drive chip, control the forward and reverse rotation of the motor, and flexibly control the car's forward, backward, in- rotation and other actions; the STC single-chip control system is closer to the people 5. A wide range of applications, training hands-on ability The universal wheel version reduces the walking resistance of the car, saves power and lasts longer Working voltage: 5V Power supply mode: 4xAAA batteries (not included in the delivery) Working current: no-load less than 300mA (the motors are working but not walking) Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Yellow&Black Material:plastic Package Contents: 1 x DIY electronic 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.