I think smoke alarms should be improved with the addition of one of these

Then when we have lots of them around our home we can set each one to a different number that determines the number of beeps we get when it starts to report low battery.
The four switch version would allow one beep right up to sixteen beeps and would be so helpful when trying to determine which unit has a low battery, one could write a small number using a magic marker, on each unit too.

Then when we have lots of them around our home we can set each one to a different number that determines the number of beeps we get when it starts to report low battery.
The four switch version would allow one beep right up to sixteen beeps and would be so helpful when trying to determine which unit has a low battery, one could write a small number using a magic marker, on each unit too.