Involve students in investigations by using their own energy to generate d.c. electricity. If the handle is turned slowly, a bulb for example, will light dimly; if turned faster, the bulbs become brighter. A high quality motor unit driven from the hand crank via 2 stage step up gearing. Capable of generating approximately 6V d.c., with the polarity determined by the direction in which the handle is turned. Supplied with 1m of detachable twin lead terminating in a pair of crocodile clips. Dimensions: 140 x 114 x 39mm. Mass: 115g.