This Tracked Vehicle Chassis traverses rough terrain and over objects in its path. Use as a stand-alone vehicle, or combine it with other accessories to make a more-complex machine with advanced capabilities. Includes a twin ratio gearbox, 3VDC motor, pre-cut wood chassis and track and wheel set. The gearbox can be assembled with either of two possible gear ratios - standard (203.7:1) or high-speed (58.2:1). Requires 2 AA batteries (not inc). Approximate overall size: 7 inches long x 4 inches wide x 2 inches high. Tamiya no. 70108.