Plantronics Blackwire C5210 Single-Ear Corded USB Headset
Amazon.com: Plantronics - Blackwire 3210 - Wired, Single Ear (Monaural) Headset with Boom Mic - USB-A to connect to your PC and/or Mac : Everything Else
Poly Blackwire 3210 USB Type-A Corded Monaural UC 209744-101 B&H