Dual 120/277 voltage. Charge rate/power ON LED indicator light and push-to-test switch for mandated code compliance testing. LVD (low voltage disconnect) prevents battery from deep discharge. 6V sealed lead acid, maintenance-free, rechargeable battery. Internal solid-state transfer switch automatically connects the internal battery to the LED lamp heads for minimum 90-minute emergency illumination. Fully automatic solid-state, two rate charger initiates battery charging to recharge a discharged battery in 24 hours. Remote capacity of 20.0 watt standard. Runs up to 8 hours without remote heads.