GE 29578 - Manual (Page 21)

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Neckloop
The unit is also equipped with the .5mm Neckloop jack for
an optional Neckloop device (to be purchased separately).
When Neckloop device is plugged in, audio signal to Handset
earpiece will be transferred to the Neckloop device. No
output on Handset earpiece will be heard.
NOTE: Inserting the Neckloop device will
not affect the behaviour of the Base Unit
Speakerphone or the Handset microphone
reception.
Mute
Use the mute button to interrupt a phone conversation to
talk privately with someone else in the room . A conversation
can be muted while using the speakerphone, handset or
neckloop.
1. Press the mute button. The mute indicator illuminates.
. Press mute again to turn it off.
Note: Switching from speakerphone to handset
cancels mute.
Vibrating Alert
The unit is equipped with a .5mm vibrating alert jack for an
optional vibrating pad to alert you when the phone is ringing.
Simply plug the vibrating alert into the jack . When the phone
rings, the pad will vibrate with each ring of the phone.