Our garage freezer plug GFCI tripped and we didn’t notice for a while, until Cally let us know the freezer light didn’t turn on (way to be alert!)
I ordered this alarm. It plugs right into the wall and if your circuit goes dead, it’ll wait a minute and then as long as the circuit is not back on, it’ll beep for 15 minutes every hour until it’s back on.
Link: https://amzn.to/3T9grL9
