-This photoelectric smoke alarm has stable performance and high sensitivity -The detector features photoelectric detection which has been proven to detect smouldering fires faster than their ionisation counterparts -This type of detector is great for most applications’ provided they are not extremely drafty or dusty -It is easy to install and use – It possesses LED light flash indicator -It can warn and alert people to stay far away from dangerous field when it detects smoke -Independent installation on ceilings and walls, with mounting bracket, which is easy to install and do not need to debug -With specially designed cover, can protect it from dust – Built-in dedicated IC: with stable performance and high sensitivity -Can monitor air and detect smoke with optical principles -When it reaches the maximum amount that the chamber can bear, it will alert -These detectors are powered from a 9VDC battery which is supplied with the unit -Smoke Detectors must be tested regularly and the battery changed annually to ensure correct operation! -Suitable for use in house, shop, school, office building, storage areas, etc -The shell is made of ABS fire-proof material and its sensitivity meets UL217 standard Package Weight: 115g Package Dimensions: 10.5cm x 3.5cm x 10.5cm Package Includes: 1 x Smoke Alarm 1 x Manual 1 x Pack Of Screws