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Here are the horn options recommended by System Sensor: Indoor, wall mounted: System Sensor P2RL (~$40) Indoor, ceiling mounted: System Sensor PC2RL (~$40) Outdoor, wall mounted: System Sensor P2RK (~$80) Ortdoor, ceiling mounted: System Sensor PC2RK (~$80) Attached is the install manual for...

Cal Fire published a bulletin back in July 2021 that said no current heat alarms are listed for installation in unconditioned spaces where temperature can exceed 100 degrees. I don't know exactly what the First Alert listing literature says, but the spec sheet I am looking indicates that the...

I spent some time a little while back trying to sort a cost effective way to install System Sensor 5604 and found that it also needs a horn and power supply. The detector itself is fairly inexpensive (~$20) and the horn is a bit more (~ $40 - $80), but the power supply is quite pricey. If you go...