Mr Beams MB785 ReadyBright Path Light for use with Wireless Power Outage LED Lighting System (1 path light only) Automatically detects a power failure and provides up to 40 hours of bright light. This light is not activated by motion, it only works in conjunction with the Mr. Beams MB220 remote control. Simple wireless installation - no electrician needed. Light can be controlled by the remote for maximum safety, convenience and battery life. Lights up stairs and hallways during a power outage. Auto shut off to conserve battery life and to turn the light off automatically if no one is home.