Product name: Tracking car small production material package. The tracking car is a basic unmanned car that can use sensors to The device identifies the black runway and controls the car to drive along the runway. Exercise children's hands-on ability and understand the structure and principles of the tracking car. Cultivate children's interest in learning and desire for knowledge, enhance children's innovative awareness and ability, and strengthen the cultivation of hands-on ability. size: 135 x 100 x 65mm Material: Wood+Plastic+Metal+Electronic Accessories colour: Package Contents: 1 set x DIY Electric Wood Racing Car Model Kit (This is just a DIY kit, not a finished product; 3 x AA Battery is not included) 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.