Just plug in this 3" x 3" polycarbonate and polystyrene light and don't worry about a switch. The photocell detects dusk and dawn conditions and turns itself on an off automatically – and is rated for up to 50, 000 hours of use. The LED beam is bright, UL certified and uses very little electricity. 3rd imprint option On Bottom DDP 2"w x 1/2"h.