Samsung HM3500 Manual page 11

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.
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