Highlights:Battery PoweredElectrochemical SensorColor : WhiteSingle station carbon monoxide alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories, and other multifamily dwellingsProvides early warning of the presence of carbon monoxideIt features an electrochemical carbon monoxide sensor, an 85dB horn, a 9 volt battery power supply, a full function test switch, a silence feature to silence unwanted nuisance alarms and a red LED light that indicates DC power or alarmIt also features a tamper resistant locking pin that locks alarm cover to prevent removal of batteryOperates between 40F (4C) and 100 degreesF (38 degreesC) and relative humidity between 10 and 95 percentDesigned for wall or ceiling mountingIncludes mounting anchors and screwsAlarm dimensions: 4.25" diameter x 1.6" height, weight: 5.1 ouncesUL Listed