Ni-Cad Battery Included - rechargeable, maintenance-free battery provides 90 minutes of emergency illumination * Long life, energy efficient, low maintenance LEDs * Dual Voltage - 120 or 277 volts * Universal Mount - mount from ceiling, with its edge against the wall, or with its back against the wall * UL listed for Damp location and complies with UL 924, National Fire Protection Association, and National Electric Code