Sennheiser HMEC 26-2 Notice D'emploi page 48

Using the headset
Make sure not to squeeze any connection cable.
Attaching the cable clip
The cable clip allows you to attach the headphone cable to your
clothing so that the cable doesn't hinder or distract you.
Loop the cable through the clip so that the headphone cable
doesn't hinder you.
16 | HMEC 26-2