When the power lines go down late at night, do you want to know?
Made in the USA!
FCA2-05-15 Failed Circuit Alarm, Power failure alarm, auto reset, Power failure
They leave the screws loose, so you can install your own 9V battery without tools.
Simple relay circuit inside. Looks like good quality workmanship and parts.
The beeper is shrill and good and loud (I've got bad hearing)..
I've installed this in the small bedroom (next to the master BR)
so I can hear it easily
and it's on a backed up circuit.
So, if the power fails tonight, it will wake me up, so I can turn on the backup (for the sump pumps etc).
And if the Battery bank goes dry and the inverter turns off, I'll be awakened again!
I took a pic of the guts, if anyone is interested, I'll post it.