Features LARGE CHASSIS This intelligent robot cart set uses a large chassis to drive the cart very stable and expand it very easily. Multifunctional: this smart cart has multiple functions, with speed connection, servo connection, tracking, barricade mounting position, etc.; It is convenient for you to expand your experiments. Simple Mechanical Structure This intelligent robot cart kit features a simple mechanical structure and is very easy to install. 4 DC Slow Down Motors:This intelligent robot car kit is powered by four slow down DC motors with high power and good directional accuracy. Speed Code Sign This smart car is equipped with a speed code sign, which can be combined with an optoelectronic system to quickly form a speed measuring system. Specification: Item type: smart robot car kit. Material: acrylic. Battery: 4 x AA alkaline dry battery (battery not included). Features: With four deceleration DC motors that rotate flexibly, good directional dependence. With four drives, the performance is solid. The chassis is large and stable and very easy to expand. Package list: 2 x trolley chassis. 4 x DC gear motor. 4 x yellow wheels. 4 x 20-wire speed dials (not usually 6-wire, 10-wire). 8 x fasteners. 24 x screws. 16 x nuts. 6 x copper posts. 1 x battery box. 7 x wires Package List 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 14 x Screw 10 x Nut 6 x Copper Post 1 x Battery Box 7 x Wire