My doorbell ("speaker" portion pictured above) got very soft today. It
still chimes, but just barely.
I'm guessing it's battery-operated and the batteries are weak, but how
can I tell for certain?
I also assume I need to unscrew the tubes from the "speaker" and
change the batteries. Is that correct?
Finally, is it dangerous to unscrew the tubes if this isn't a
battery-operated doorbell (ie, risk of electrocution?).
Best Answer
Seeing screws with wires attached to them is a good sign the doorbell is hardwired (not battery operated), in a battery operated fixture the wires would be soldered to a circuit board.
If you live in the U.S. you are probably dealing with 12 to 24v at the chime, though the power should still be shut off at the main panel before you start working.
Here is a good guide to troubleshooting a doorbell.