VTech I5866 ユーザーズマニュアル

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Your  i 5803 Handset is equipped with a 2.5mm Headset Jack for use with an optional
accessory Headset for handsfree operation. If you choose to use the Headset option,
you must obtain an optional accessory Headset that is compatible with the i 5803. For
best results, use a VTech 2.5mm headset.

Once you have a compatible 2.5mm Headset, locate the Headset Jack on the i 5803
Handset. Connect the plug on the Headset cord to the jack (under a small rubber flag)
on the cordless Handset. The plug should fit securely. Do not force the connection.

Whenever a compatible Headset is connected
to the cordless Handset, the microphone on the
Handset will be muted. This is done to limit the
effect of background noise.

Many compatible Headsets have a reversible,
monaural design. This means you can wear
your Headset  on either ear, leaving one ear
free for other conversations.

The  i 5803 is also equipped with a detachable
belt clip. Align the pins on the inside edge of
the clip with the notches on the sides of the
Handset. The belt clip should snap securely into
place. Do not force the connection.