Dual-Voltage Input 120/277VAC Operation. UL Listed for Damp Location (0°C ~50°C). Two rate charger initiates battery charging to recharge an empty battery in 24 hours. 90 Miuntes Minimum Emergency Operation. Suitable for installation inside, on top or in remote of the fixture. Battery, Charger and Inverter Circuit included. 2.4V long life, maintenance-free, rechargeable sealed NiCd battery. White finish.