This fire monitor utilizes a supervised circuit and comes with a UL Listed Fire Detector.
An intermittent audible warning is sounded if the circuit is malfunctioning and a constant audible sounds if there is a fire emergency.

Loud audible built into the panel rated at 85 dB at 5 ft
Intermittent sound means a circuit fault
Constant audible indicates fire emergency
Red warning light
Mute button
Test button
Green power ON light
Includes (1) UL Listed Fire Detector 190F