It does that very well, and I like that you can mute the damn thing so as not to hear incessant annoying beeping if your electrical company gives you the same "service" they give to me

I gave the device four stars instead of five because it emits a series of loud beeps when the power cuts out and the beeping cannot be turned off.

Provides audible "beep" if power is dropped.

I have to leave it off for at least a minute to keep it from starting up with a failure alarm, which will sound a loud beep every minute while the unit is on

When it stopped working it also made many beeping noises that really bothered my dog's until I got home and unplugged it.

The beeps are obnoxious and the cats and I all hate them, but on the other hand, you know for sure when the power blinks off and on, stays off, and is restored

The Tripp Lite protects my computer and emits a very loud beep to alert when there is a power interruption (until the beep is muted)

The beeping does nothing but irritate users

My co-worker's beeps, as well