American Educational 7-1853 DC Crank Generator, 6-1/2" Length x 2-1/2" Width x 4-1/2" Height Hand-cranked DC generator provides up to 12V DC for experiments requiring a power supply for students in grades 6-12 Clear plastic housing is lightweight and durable Binding posts provide a connection to an outside electrical circuit Includes a mounted lamp for use as a flashlight Measures 4-1/2 x 2-1/2 x 6-1/2 inches (H x W x D)