Sennheiser PC120 and PC30 Headsets
 

At first look, you'd think I was wearing a Bluetooth headset, but the
cable is a bit of a giveaway. It's a small one piece device that clips
on to your ear. The headphone portion of the device pivots around 180
degrees so that it works on either ear. The ear piece fits inside your
ear and provides most of the support, while the shroud around your ear
just gives it that little bit extra.