Sennheiser SC 165 USB (508317) - Double-Sided (Binaural) Headset for Business Professionals | with HD Stereo Sound, Noise-Cancelling Microphone, & USB Connector (Black) : Amazon.co.uk: Everything Else
Epos Sennheiser Adapt 261 Bluetooth Wireless Binaural Headset with USB Dongle Black 1000897
Sennheiser SC40 USB Ctrl Monaural Headset - Commlinks