Description: Material: Constructed from acrylic material, the smart car chassis is both lightweight and sturdy, ensuring long-last performance in your DIY projects Easy Assembly: The intelligent car chassis features a simple mechanical structure, making it extremely convenient to assemble, suitable for both beginners and experienced hobbyists Powerful 4WD System: Equipped with four high-power DC motors, this chassis offers flexible turning and directional control. Its four-wheel drive ensures ample power for various applications Stable Design: With a large and stable base, this chassis is ideal for expansion projects, allowing you to easily add additional components or sensors as needed Speed Measurement System: Comes with built-in speed measurement encoders that can be paired with photoelectric speed sensors to quickly set up a comprehensive speed measurement system capable of measuring speed and distance Specification: Material: Acrylic Size Chart: 26cm/10.24inch Package Includes: 1 Four-Wheel Car Kit Note: 1.This is not infant toy, please take away from children to avoid eating. 2.Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.