Please Note: The AMP key controls both the loudness & tone frequency of the handset.
Using the Amplification Reset Override Switch (located on the underside of the base) The ClearSounds® CSC600D is designed with unique features to protect users from being exposed to dangerous sound levels. You are able to switch between automatic or manual amplification, and you should select the setting that best suits your needs.
Set ON – When the Amplification Reset Override Switch 
is set to ON, the amplify function will be ON every time a call starts. The user will no longer need to remember to press the AMP key with every telephone conversation. When the phone hangs up, the amplify setting will remain ON.
Set OFF – When the Amplification Reset Override Switch 
is set to OFF, the amplify function will be OFF every time a call starts. This allows people who do not require the level of amplification offered on the phone to use it. Every time a call starts, the user will need to press the AMP key in order to gain the extra level of amplification and tone control. When the phone hangs up, the AMP key will reset to OFF.
Important: You may manually turn ON and OFF the amplify function during a conversation by simply pressing the AMP key.
NOTE: Your ClearSounds® CSC600D comes from the factory preset in the OFF position. If you would like to override the factory preset, simply change the selection on the underside of the phone to ON.
█Ringer Setting
You can adjust the ringer of your phone as high as +95 dB. There are 2 methods to set this feature.
Method 1 (Volume Only):
By adjusting volume on the right side of the phone
In standby mode, you can adjust the ringer volume by using the Volume Control VOLUME- or VOLUME+ on the right side of the phone. The display will show the current level. For
