Motorola HS850 Manual page 26

Volume Orientation
To change the volume button orientation
for left or right ear:
Step
1 With the headset's boom closed,
press and hold the Multifunction E
button until the headset indicator
turns on (about 3 seconds).
2 Press the volume button that you
want to use as the volume up. The
headset indicator will flash several
times to indicate success.
Repeat the above steps anytime to
change the volume button orientation.
24 Using Your Headset