This basic little alarm detects smoke and sends out a piercing siren / A potential life saver / Uses 9V Battery (included) # Better safe than sorry. When it comes to smoke, sorry can be fatal. From one of the leading manufacturers of home safety alarms, the 900-0159006 is designed to detect smoke. Simply mount it on the ceiling, near a fire source (i.e kitchen). When smoke gathers around the alarm, it'll dut out a loud sound. Uses 9V Battery (included)