Mr Beams MB265 ReadyBright Wireless Power Outage LED Lighting System Path/Stair Light Kit (Includes 2 Path Lights + Detector) Automatically detects a power failure and provides up to 40 hours of bright light Simple wireless installation - no electrician needed Light can be controlled by the remote for maximum safety, convenience and battery life Power Outage Detector is a remote and a flashlight Auto shut off to conserve battery life and to turn the light off automatically if no one is home