"Just mount the charger inlet to the boat, and hardwire directly to your onboard battery charger, and your hatch will never have to be left open while charging. With the hatch closed and locked, thieves can't get to your valuable charger. Rated at 15 amps, 125V. 2.5"" Dia.x1.943"" Deep. Requires a 1-7/8"" diameter hole. Charger inlet mounts to boat and hardware to your onboard battery charger Keep hatch closed while charging With hatch closed and locked, charger is safe from thieves 15-amp rating"