Product details:

The most compact & slim type in the market - Back & Ceiling Mountable, Extra Face plate included (double side) & Universal Easy snap mounting canopy. - Energy Consumption of less than 2 watts - LED lamp life of 25 years plus - Compact, low profile design in neutral finish120/277 VAC dual voltage input - Automatic, low voltage disconnect (LVD) protects battery from deep discharge - Universal pop-out arrows can be put back in if desired(latest chevron code-UL924)ETL listed (Damp Location, too)Fully-automatic operation to test switch - Battery AA Ni - CAD 3.6V 900m - Ah