EPOS Sennheiser MB-PRO1 Mono Bluetooth Headset - VoIP Supply
PC 7 USB Mono USB Headset
Amazon.com: Sennheiser SC 135 USB (508316) - Single-Sided (Monaural) Headset for Business Professionals | with HD Stereo Sound, Noise-Canceling Microphone, & USB Connector (Black) : Electronics
EPOS / Sennheiser SC 30 USB CTRL Mono Headset with Call Control for Skype 504548 615104236905 | eBay
EPOS/SENNHEISER IMPACT SC 45 USB MS Mono On-Ear PC 1000634 B&H
Sennheiser PC 26 USB Mono Headset - Walmart.com
EPOS/SENNHEISER Impact SC 230 USB Mono Wired On-Ear 1000516 B&H
Amazon.com: Sennheiser Consumer Audio PC 7 USB - Mono USB Headset for PC and MAC, Black (504196) : Electronics
Epos Adapt 230 Bluetooth Mono Wireless Headset w/ USB-A Dongle