Roybens 2-Pack Battery Powered Stick-on Portable PIR Motion Detection Sensor LED Light Bar, Intelligent Night Lamp with Handy Velcro Straps for Closet/ Under Cabinet/ Drawer/ Bar Sets/ Stairs/ Bedroom Auto PIR motion detection: Light only activate on when the ambient light is dark (&lt;2Lx) and people get closed within 3 meters, and will go out 16 seconds after leaving the sensing range. High sensitivity, anti-jamming, silent, speedy reaction, Humanized induction distance, exquisite appearance, fashionable and ultra-thin. Low power consumption, 3x1.5v AAA batteries (not included) can last up to 180 days under normal usage.(lighting up 20 times per day (300 seconds); 30,000 hours LED span life. Easy to stick on or remove with the Handy Velcro Straps. Suitable for the usage in auto trunk, bedroom, closets, cabinet, mirror, corridor, workshop, basement, garage, stairwell, oil depots, roof, door, garage entrances and other places