Fangrui Product Details 1. The Kit Is Compatible With Various Development Boards. With This Kit, You Can Make Your Own Robotic Smart Car. 2. Reserved For Cars, 51 Mcu Control Panels, Our Drive Module, Tracking Module, Obstacle Avoidance Sensor Photoelectric Switch Hole, Easy To Assemble And Expand. 3. Simple Mechanical Structure, Very Convenient To Install. 4. Four Deceleration Dc Motors Are Used For Flexible Turning And Good Directionality. Four-wheel Drive, Full Of Horsepower. The Chassis Is Large And Stable, Very Easy To Expand 5. Double-layer Structure: Easy To Expand Product Description Voltage: Dc 6v Current: 120mah Deduction Ratio: 48:1 Rpm (with Tires): 240 Speed: 6.0v 100rpm/min Tire Diameter: 66mm Motor Size: 70mm X 22mm X 18mm (4 With Gears) Chassis Material: Acrylic Color: Black Material: Plastic Package Contents: 1 Set Of Assembled Electronic Auto Parts 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 L