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Monitoring phone conversations

When speaking through the handset, you can press to allow a third

person to listen to the conversation through the speaker. (To turn off the speaker, press the key again.)

To adjust the volume of the speaker when monitoring a conversation, press

or (the volume reverts to the lowest setting each time the handset is replaced).

Note that the speaker cannot be used for speaking; it is only for listening.

To avoid feedback (a loud howling sound), be sure to turn off the speaker

(press once again) before you replace the handset.

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Sharp UX-B30 manual Monitoring phone conversations