Beep Beep revealed

After three maybe four years of beeping going off in our office which you could only hear during quiet times, I have found the source of the noise.  Closed up inside a box of odd electronic bits and pieces was a smoke detection alarm that had been removed from the kitchen due to its sensitivity and repeated bleeting during cooking.  The battery had been left inside and was sounding off once per minute for the last three years.

At least it still works