EPOS Sennheiser MB Pro 1 ML - Bluetooth UC Headset - Includes USB Dongle for Microsoft
SC260 | Sennheiser Circle 260 Corded Headset | Headset Experts
Amazon.com: Global Teck Worldwide Sennheiser SD PRO1 Cordless Headset Bundle for Pc, Mac - Compatible with Desk Phones - Cisco, Polycom, Avaya, Yealink, Mitel, IP Telephones, Digital and Softphones : Electronics
Sennheiser SD Office ML DECT Wireless Headset - IP Phone Warehouse
Amazon.com: Sennheiser SC 45 USB MS (507083) - Single-Sided Business Headset | For Skype for Business, Mobile Phone, Tablet, Softphone, and PC | HD Sound & Noise-Cancelling Microphone (Black) : Everything Else