No Battery Needed- This closet motion sensor ceiling light must be hardwired to a standard 4 in junction box, no battery need. Do not work with solar system. | Automatic ON/OFF- This motion sensor indoor light automatically comes on when motion detected in 10 feet range and turns off in 30 seconds when no motion was detected. You could leave the room without turning the light off, it will turn off itself. No more worries! NOT Dimmable. | Super Slim Design- The super slim design gives you more clearance space. Won't bump your head, safe to use. | Real Time Saver- Straight forward installation to 4 inch junction boxes. No bulb to replace, maintenance free. Stay away from the hassle of changing batteries or recharge! | You buy, we guarantee- 5 year limited warranty assures the rated 25,000 lifetime (average 3-5 hours/day). Contact us for fast customer service and technical support