Single station carbon monoxide alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories, and other multifamily dwellings. Provides early warning of the presence of carbonmonoxide. It 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 alarm. It alsofeatures a tamper resistant locking pin that locks alarm cover to prevent removal of battery. Operates between 40F (4C) and 100° F (38° C) and relative humidity between 10 and 95 percent. Designed for wall or ceiling mounting.