Note: Lamp only work at dark! Adopting advanced radar detection technology, it is more sensitive and penetrating than infrared sensors. The radar sensor bulb can detect movement on the other side of the wall (the thickness of the wall should be less than 8 inches). It will open when it detects any object movement and automatically close after 30 to 40 seconds of no movement. LED bulbs will only light up in the dark and dusk when movement is detected and they stop working during the day. LED bulbs are more energy-efficient than traditional motion sensor bulbs. Specifications: Base type: E27, Voltage: AC220V;110V;85-265V, Power: 12W, Lighting color: Cold White (6500K), Built-in Microwave Radar Sensor and Light Sensors, Detection angle: 120 degrees, Detection distance: 1-6M, Delay time: 30s-40s, Material: PC+aluminum