These sensor lights light up for about 10 seconds when movement is detected in a dark area. It also features a magnet and a hole for you to easily install this in various places such as staircases or closets for your safety and convenience. Plus, these lights have integrated sensor lens and body cover so it can be used even with a wide sensing range of 3 meters horizontally and vertically. When the sensor detects human presence in the darkness, the LED turns ON for 10 seconds and then turns OFF. The LED does not turn ON when the surrounding is bright.