HOUSING --Injection-molded thermoplastic ABS housing. --UL 94V-0 flame rating. --Innovative,snap-together design allows for fast installation. --replaceable directional chevron inserts are easily removed and reinserted. --Letters 6'' height with 3/4'' stroke. --Single or double face configuration. MOUNTING --Universal(Wall,side or Ceiling) mounting. --Housing snaps to canopy with simple twist and locking tightly secure housing to canopy. ELECTRICAL --120/277 VAC Dual voltage operation. --Low energy consumption-only 2.4 watts at 120V. --LED indicator light and push button test switch. LAMPS --LEDs mounted on print circuit board. --LED lamps are operating in normal (AC input) and emergency (DC input ) modes. BATTERY --Nickel-Cadmium battery delivers more than 3 hours capacity to emergency lamps. --24 hours recharge after 90 minutes discharge. --Low voltage battery disconnection - Preventing deep discharge damage to the battery.