Just connect this device to a 9-volt battery and plant it in an appropriate location. It produces a one-second electronic chirp about once every 3 minutes.

Just connect this device to a 9-volt battery and plant it in an appropriate location. It produces a one-second electronic chirp about once every 3 minutes.

It’s the same as my smoke detectors. When the battery starts going dead they chirp and drive me nuts. Question: why does this always happen at 3:57 am? It’s maddening.