Features: Uses human infrared sensor technology and automatic light detection technology. When a hand approaches the door lock, the LED light installed aboves the door lock will light up automatically. When people are around, light is on. When people leave, light goes out automatically. Make it convenient and safe for you to enter your home. When you go out, you don't have to lock the door in the dark. Easy Installation and movement detection. Specifications: Materials: ABS Size: about 81x46x30mm/3.19x1.81x1.18inch Delay: 6-8s Sensing distance: about 3.0m/118.11 inches Sensing angle: 120 degrees Battery: AA Battery (not included) Package Includes: 1Pc LED Bulb Door Lock Light note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.