Battery Powered Strobe Light - Hazard Flashing Lights with Magnetic Base - AMBER LENS - HDFL-AA Magnetic mount beacon is battery powered & provides 50 hrs. Of operation on single set of 4 AA batteries This Fixture is designed for heavy duty use in applications where intense vibration and Corrosive environments may be encountered The hdfl-aa beacon is waterproof and resistant to shocks and vibrations Operation of this unit is controlled by a simple rocker switch located on the side of the housing Has no need for wiring or external power sources & produces a brilliant signal visible over 1 mile