S-1113: 12V Solar Panel Battery Charger use Amorphous silicon solar cells (11 1/2" x 3 1/2") Power: 2 Watts max. Working voltage: 12V max, Working current: 150mA max. Dimension: 13 1/2" x 4 3/4" x 7/16" Comes with battery clamps, and cigarette lighter plug.