Filter
Top Products
E
N
G
L
I
S
H
4
Volume Control
Adjust the volume to the most
comfortable listening level by moving
the volume control slide switch.
Boost Button (HA-40 only)
Press and hold down the Boost button
for more amplification. It also eliminates
any background noise and feedback by
muting the microphone in your handset.
You must remember to release the button
when you speak so that the other party
can hear you, then press and hold the
boost button again when they speak.