Clarity A Division of Plantronics Inc. C4210B ユーザーズマニュアル

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OFF – When the BOOST ON/OFF switch is set to 
OFF, the Boost function will be OFF every time a call 
starts, and the user will need to press the BOOST 
Clarity Power button in order to gain the extra level 
of amplification. If the phone hangs up, the Clarity 
Power will reset to OFF. During a call, the BOOST 
Clarity Power button can toggle the Clarity Power 
function ON or OFF according to the user’s needs.

       
      CAUTION: VOLUME WILL BE LOUD  
      WHEN BOOST SWITCH IS SET TO “ON.”

Installing four (4) AA Alkaline batteries into the  
desk/wall mount bracket attached to the telephone 
base will offer you a limited amount of time to con-
tinue operating your telephone in the event of  
a power failure.

1.  Disconnect telephone line cord and  
 

remove desk/wall mount bracket from  

 

telephone base.

2.  Disconnect battery back-up connector from  
 

the telephone base.

3.  Install four (4) AA Alkaline batteries  
 

with negative (-) end of battery touching  

 

the spring.

4.  Connect battery back-up connector to  
 

terminal on bottom of telephone base.

5.  Install desk/wall mount bracket to  
 

telephone base.