120/277V dual voltage operation. 10W high power LED lamp (700 lm, 5000K) for normal & emergency operation. Test switch and charge rate indicator with self-diagnostic charging circuit. Rechargeable Ni-Cad battery (6V 5ah) delivers more than 90 minutes of emergency operation. Low voltage battery disconnection prevents deep discharge battery damage. 0 degree celcius minimum temperature. Units for cold weather locations (-20 degrees celcius) available upon request.