Clarity xl40d User Manual page 11

DCP: Boost
XL40D Training
The BOOST button controls the loudness of
the receiver. Once the BOOST button is
pressed, an extra level of amplification is adde
over the entire range of the Volume Control.
BOOST also activates the Tone Settings
On the bottom of the XL40D, there is a Volume
Reset Override switch. When this is set to
"On" the Boost function is automatically
enabled every time the phone is picked up.