【Quick smart 】The smoke by the change in the intensity of the infrared light scattered in the smoke. When the light intensity received by the photosensitive receiver exceeds the set value, the piezoelectric horn will be driven to sound an alarm. 【Easy Installation】 No need to connect wires, just use the attached screws to fix the anchor plug on the mounting bracket, and rotate the smoke sensor to the right to the gap to complete the installation on the wall or ceiling. 【Reliable Security】 When the smoke sensor has a short circuit, open circuit or other bad conditions, the smoke alarm will automatically detect and send a fault signal. Protect family and property safety in time. 【Long product life】 Compared with other battery and machine integration products, the product has a 10-year lifetime and a 5-year replaceable DC 9V battery operated, which is more user-friendly. 【High standard, safe and reliable certification】 The smoke alarm has passed CE certification and British BRE certification, providing you with better safety and reliability., Weight: 0.3968320716 pounds, Manufacturer: Isafenest