• 4 pack LED double-face exit signs in fire retardant, injection-molded, thermoplastic ABS housing 
• Wall, ceiling, and end mountable; Input Voltage: 120/277VAC 60HZ 
• Long-lasting Epstar SMD LED light with test switch and charge indicator light 
• Nickel cadmium battery provides 90 minute backup power in the event of a power outage; 1.2V 1000mAh 
• UL-certified with a UL-94-5VA flame rating plus overcharge and over-discharge protection 
• Operates in damp, but not wet, and dry conditions; operating temperature 0-40 degrees Celsius