Instantly add motion-activated light for security and safety - indoors or out Infrared technology senses both movement and heat for fewer false activations; daylight-off function Compact (3 in. x 3 in.) and lightweight (4.3 oz.) lets you install almost anywhere; easy-mounting slot 10 super-bright LED cast pure white light, last for 100,000 hours, sip battery power Wire-free installation, operates for months on 3 AA batteries (not included); lead-free RoHS-qualityEffective tool for both security and safety; the sudden activation startles unwanted visitors but also provides safe entrance and room lighting for your family and guests. We were very impressed with the performance of this device in our tests. The sensor is quite sensitive, very quick to light and we experienced no false activations. An excellent way to add automatic light to dark closets and cabinets; makes a great night light for safer navigation without producing constant light - especially helpful during power outages. Effective range 10-15" front, 15-20" side-to-side, 30-second auto-off; white finish matches any decor. Outdoor installation should only be done where unit will be protected from direct exposure to elements. Also has constant-on setting when needed. 3 in. x 3 in. x 1-3/8 in.; 4.3 oz. with 3 AA batteries installed (batteries not included).