This dusk to dawn controller is outdoor rated and can withstand salty marine air environments.
It can handle up to 10 amps of 12v DC current with a momentary 600 watt surge. In standby mode, it consumes only 0.15 milliamps and 16 milliamps when powering a load.
It will turn incandescent, halogen, or fluorescent lights ON in the evening within one half hour of sunset and OFF in the morning within one half hour of sunrise.
Installation is simple with only three wires and an LED located beneath the Watchman's lantern indicates if the load is on. It measures 1" x 1" x 1" and surface mounts. Made in the USA. Two year warranty