What camera beeps on its own?

I put my cameras in a cabinet. For months, a very loud beep sound comes from this cabinet. I cannot locate the source of this auto beep

It must be a battery operated camera.

Take the battery operated ones out one or two at a time and set them near where you are at your desk, or reading. I have the devil of a time when the battery is low on one of the numerous mandated smoke alarms - same thing, but I have to stay near each till one beeps to find the problem child. Sooner or later... ! Edited November 8, 2020 by Sandy Vongries

Sandy, thank you for your suggestion.

 

There is one Leica R4 and on Leica R5 in the cabinet

 

An Exakta Varex IIa is also in the same cabinet, but Exakta cannot be the culprit

 

as it has no battery compartment

 

I took out the SPX76 button cells in R4, I haven't

 

touch this camera for quite a long time, the battery

 

could be running low, and the camera issues a

 

loud warning beep. Let see if this solves the problem

 

If not, I shall take out the batteries in R5