The Eco-Lite 5 LED Power Failure Lights turn on when the power goes out. These power failure lights plug into the wall to charge and can be used as a nightlight, worklight or a power failure light. They have a running time of 6 hours on low beam & a runtime of 3 hours on high beam with 25 lumen power. Be prepared when the power fails with the Eco-Lite 5 LED Power Failure Lights