Leitner Wireless Office Headset: Premium Plus Series
Sennheiser SC 135 USB (508316) - Single-Sided (Monaural) Headset for Business Professionals | with HD Stereo Sound, Noise-Canceling Microphone, & USB Connector (Black) - Walmart.com
EPOS/SENNHEISER IMPACT SC 30 USB ML Mono On-Ear PC 1000550 B&H
Sennheiser Office Wireless Replacement Headset
Sennheiser USB Office Headset Double-Sided HS with SC60 USB ML Microphone | eBay
Sennheiser Circle SC 230 USB MS II Monaural Headset RRP£100 Office Headphones | eBay
Amazon.com: Sennheiser DW Pro 1 Single-Ear Wireless Office Headset with DECT 6.0. Includes Noise-Canceling Microphone. Works with PC and Mac : Electronics