Amazon.com: EPOS Consumer Audio Sennheiser PC 8 USB - Stereo USB Headset for PC and MAC with In-line Volume and Mute Control, Black, Small : Everything Else
New Sennheiser Audio Headset PC 7 USB Mono E Learn for PC and MAC Plug and Play | eBay
Sennheiser PC 7 USB (pc7usb) On Ear PC/Phone Single Sided Headset