Poly – formerly Plantronics – Voyager Focus 2 Wireless Noise Cancelling On-Ea… – St. John's Institute (Hua Ming)
Poly Plantronics Blackwire 5210 USB A and 3.5mm Corded Headset On-Ear Mono Headset Wired Active Noise Canceling Cancellation ANC with Boom Mic Connect for PC Mac Windows Tablet Mobile Phone Earphones Headphones
Buy Plantronics Blackwire 7225 USB Corded Headset ANC - Black