Plantronics Backbeat Fit 2100 Questions & Answers

! ) Must have music playing to adjust volume, if desired lower volume on phone to middle setting, to prevent music from playing too loud, until you learn the volume control on the headset.
2 ) On left side, locate small button on top - middle of round part.
3 ) To lower volume press & hold in, until says minimum or desired volume level.
4 ) To raise volume, press & release button until desired level.
5 ) My headset can be pressed 15 times for max volume.
6 ) I recommend not using above 12 presses, for longer battery power.

Hi, go online to the Plantronics registration page, you will need to take an image proof of purchase.
The serial # is behind one of the earpieces, It is tiny! I photographed it, and zoomed out to read it.
You are requesting a replacement unit, I had a response within minutes. Good luck