The Honeywell 5808W3 is a wireless heat and smoke detector. The 5808W3 utilizes a photoelectric smoke chamber for smoke protection as well as a temperature sensor that can detect high temperatures (135° F) and low temperatures (41° F).

When the 5808W3 wireless heat and smoke detector is first powered up, the red and green LEDs will blink simultaneously once every (5) seconds for approximately (20) seconds. After the power-up sequence is over, the smoke detector’s green LED will blink once every (10) seconds to indicate normal functionality. If the detector needs to be cleaned or replaced, the red LED will blink once every (5) seconds. When an alarm is triggered by the presence of smoke, the red LED blinks once per second. When an alarm is triggered by a thermal condition (greater than 135° F temperature) the red LED blinks every (4) seconds. If a freeze condition is detected (less than 41° F), the red LED will blink once every (10) seconds. Finally, if a low battery condition is detected, the red LED blinks once every (45) seconds until you are able to replace the battery.