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
EPOS / Sennheiser DW Pro 2 ML Wireless Office Headset System DW 30 UK 504464 NEW | eBay
Compatible Replacement Battery For Sennheiser Officerunner, DW Office,