PIR Motion & Light Sensor: Auto-on within 13 feet, refract soft lighting, auto-off after 20 seconds of no motion detected helps prolong battery life. It will turn on only when it is dark and when motion is detected. Super-Bright LED Bulbs & Long Life: Built - In 2 LED Lamp beads bright enough to make sure you can see the things you want in the dark. Super-bright LED bulbs last up to 50,000 hours, stays off during daylight hours. Wireless Install: No hard-wiring, just by double-sided adhesive pads and screws mount, you can stick on anywhere you like. Portable Battery Operated: Powered by 4PCS AAA batteries (not included). So, you can check your closet, especially during the time of blackout. Please Note: This light can only be turned on in darkness environment. It won't turn on if the light sensor has been detected by the enough light. And Please DO NOT install this light in high temperature place or damp place such as bathroom, very wet outdoor and so on.