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Input Voltage........................................................ (Dual) 120/277 VAC, 60Hz Input Rating.................................................................................... 2.0 Watts Output Voltage.....................................................................24 VDC Nominal Output Current..................................................................500 mA (constant) Output Power...............................................................................12 W (Max) Emergency Operation...................................................................90 minutes Operating Temp............................................................................0° to 55° C Battery................................................................................. Nickel-Cadmium 24 Hour Recharge 7-10 Year Life Expectancy Weight............................................................................................... 4.5 lbs. UL Conditions of Acceptability..................................... Must be factory wired Battery temperature must not exceed 55° C