Rugged Pelican case engineered with 90 db audible warning alarm, Red warning micro strobe, 15' power cord and 2, 9 Volt DC batteries to power the alarms, makes this a power house in the field. This system gives both an audible and visual warning to either user or safety monitor indicating that the 120 VAC power source is no longer working. Plug power cord from Loss of Power case into 120 VAC outlet, plug equipment into outlet receptacle on the case. Rubber boot sealed on/off switch.