Tamiya 3-Speed Low Current Motor GearboxEducational Construction Series KitThis is a Tamiya 3-Speed Low Current Motor Gearbox Educational Construction Series Kit. This new Educational Construction Series gearbox can be operated by both alkaline batteries (1.5 to 3.0V) and electricity generated from a solar panel (0.5V or1.5V) and can be assembled with three different gear ratios to enable various hobby applications.Features and Specifications:? Outer Case is Clear to Allow the Internal Mechanisms to Be Viewed? Gearbox Features Three Gear Ratios (12.7:1, 38.2:1 and 114.7:1)? Includes 3mm Hex Drive Shaft (Length: 100mm)? Included Crank Plates Can Also Be Used as Wheels? Includes RC300-FT-14270 Motor? Can Be Powered By 1.5 to 3.0 Volt Alkaline Cells or 0.5 to 1.5 Volt Solar Cells? Illustrated Instructions