Always Ready When You Need It Don't leave your family in the dark. Be ready for even extended power failures with LIGHTS OUT, a long lasting, rechargeable, LED safety light. Simply plug it in to any standard electrical outlet with the removable 6' AC adapter, choose your settings, and you'll be ready when the lights go out. We combined a powerful, rechargeable 6 volt battery with high intensity and energy-saving LEDs. The result is an emergency back-up light that lasts up to 20 hours using both lamps, and up to 40 hours when set to a single lamp. The battery can be recharged over and over and the LED bulbs will last for years. The inch on-off inch switch lets you turn off the lights when not needed, to conserve battery life during a power failure. Many similar-looking models cannot be turned off, beware of imitations! The LIGHTS OUT is for indoor installation use only.