Davis Mega Low Current Masthead Light Consumes very little current At just 0.110A, battery discharge is about one amp-hour in a 12-hour period Waterproof dual-function Fresnel lens which projects light for up to 2 nautical miles Includes a stainless steel mounting bracket, a 12" wire lead for hard-wire installation and light sensor circuitry for automatic switching capability Dimensions: 2"dia. x 2-3/4"H