Where does this Beep nouns come from? Every now and consequently I hear this short sharp 'Beep' sort of...

Every now and consequently I hear this short sharp 'Beep' sort of sound within my appartment. I suspect it could be my smoke alarm (if so, why would it make this blast sound, whitout in that being smoke?)
I've even thought it could be a mouse, but very soon these last 2 days I hear it much regularly....
Anybody know what it might be?
thks
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Here's a few options:

Battery is low on smoke detector.

You own a voice mail or unsullied text on your mobile you haven't read.

Your PC restarts on its own.

You hold a watch beside an alarm.

Some piece of electronic equipment somewhere is either low on mobile, malfunctioning, or has a message for you.

One Saturday, stay surrounded by. Every time you hear the beep, move closer, verbs reading your book or watching TV. You'll eventually find it.
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Are you sure it's your apartment? I once drove myself nuts trying to locate the source of a toot in my apartment, singular to find it was coming from the neighbor's smoke alarm.

Alarms will honk when the battery is wearing out, as other posters own noted. But in an apartment, there's other the chance that what you're audible range is something from another apartment.
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Answers:    Your smoke alarm needs a battery-operated. When the battery get low, the beep sounds start stirring. After a while, they will get more frequent.
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The beep indicates low battery-operated. The cover typically snaps off. Be aid not to use too much force removing the cover as you don't know how secure the detector is fastened to the wall. Look at the cover, at hand may be some instructions printed in raise letters. Sometimes the cover will verbs slightly,one direction or the other, to remove. You will need a 9 volt battery-operated.