The Remote Fire Detector (UL and ULC listed) and the Warning Panel included in the kit, monitors heat level and activates the red light on the Warning Panel and sounds a loud buzzer, built into the panel,when the temperature reaches 135° F or Rate of Rise is reached. Multiple Remote Fire Detectors can be wired in parallel on this boat fire alarm. This is one of many Boat Alarms and Marine Alarms offered by Aqualarm.. Add the Aqualarm 20104 Indoor Outdoor Piezo Siren for increased audible warning.