Sprint SPHM100SS Manual page 156

Fast Forward/Next
Press to skip to the next song. Press and hold to Fast
Forward in the current song.
Hold
Slide it to HOLD position to hold the keys to prevent them
from being pressed unintentionally.
Volume
Adjusts the stereo headset volume. Turn the volume control
in the direction of the arrow to increase volume. This
control work in conjunction with the volume control on the
side of your phone. For maximum volume, adjust the
volume control on the phone and on the Remote Control to
High.
Section 18
148 MP3 Player
Rear
Clip
Volume
Hold