1Simple Mechanical Structure: This smart robot cart kit adopts a simple mechanical structure and is very easy to install. 24 Decelerated DC Motors: This smart robot car kit is powered by four deceleration DC motors with high power and good directionality. 3Large Chassis: This smart robot cart kit uses a large chassis to make the cart ride very stable and very easy to expand. 4Multifunctional: This intelligent cart comes with multiple functions, with speed port, servo port, tracing, barricade fixing position, etc.; it is convenient for you to expand your experiments. 5Speed Code Plate: This intelligent car comes with a speed code plate, which can be matched with an optoelectronic system to quickly form a set of speed measurement system. Item Type: Smart Robot Car Kit Material: Acrylic Battery: 4 x AA Alkaline Dry Battery ( Shipped Without Battery ) Features: With four deceleration DC motor turning flexible, good directionality. With four drives, horsepower is solid. Chassis is large and stable and very easy to expand. 2 x Trolley Chassis 4 x DC Gear Motor 4 x Yellow Wheel 4 x 20 Wire Speed Dial ( Not Ordinary 6 Wire 10 Wire ) 8 x Fastener 24 x Screw 16 x Nut 6 x Copper Post 1 x Battery Box 7 x Wire Have a great time shopping!