The Energizer Weather Ready Rechargeable LED Light turns on automatically in a power outage. You can remove this light from the wall outlet and use it as a portable flashlight with high and low brightness levels. The integrated AC plug can be flipped up and out of the way when using as a flashlight. 3 position slide switch: 1. On - When plugged into a wall outlet, the light will turn on automatically if the power goes out. When unplugged, for use as a portable flashlight (with brightest output mode). 2. Off / Charge 3. Nightlight / Charge - Low output mode for use as a nightlight or portable flashlight (with lowest output mode). Features: when plugged into an outlet and with switch in ON mode, light will turn on automatically in a power outage powered by a rechargeable NiMH battery up to 15 hours of run time in low mode integrated AC plug flips down for plugging into any standard wall outlet; fold up for use as a portable flashlight Benefits of LEDs (Light Emitting Diode): Uses less energy, so batteries last longer No need for costly and hard-to-find replacement bulbs LEDs are virtually unbreakable LEDs have no filament to burn out and no glass to break