Intelligent Tracing Robot Car Chassis, ideal for DIY projects, science education, hobby development, and educational toys. Mechanical structure is simple, equipped with 4 DC gear motors, enabling flexible turning. The stable chassis design is easy to expand. No additional assembly required; the entire system is highly integrated. Can be used to measure distance and speed. Educational kit for beginners (kids) to gain hands-on experience in robotics. Compatible with electronic systems for functions such as line tracing, obstacle avoidance, distance measurement, speed measurement, and wireless remote control. Size: 25 x 14 cm (L x W). Wheel size: 6 x 2.7 cm (Diameter x Height). Motor power supply: 3V ~ 6V. All parameters are tested without load. Color: as shown Material: Plastic Package Contents: 2 x Car Chassis 4 x Gear Motor (1:48) 4 x Car Tires 4 x Speed Encoder 8 x Fasteners 1 x Battery Box (batteries not included) Only the items listed above are included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.