Samsung HM6450 Manual page 13

Using as a stereo headset
Use the supplied neckstrap headset with the shirt clip.
1
Remove the ear hook and attach
the shirt clip.
2
Plug the connector of the
neckstrap headset into the
Multifunction jack on the headset
and wear the neckstrap headset.
3
Clip the headset to your clothes
using the shirt clip.
Noise reduction is off when using the neckstrap headset.
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