Sennheiser Impact SC 260 MS II USB Wired Headset SCWH22 | eBay
EPOS IMPACT SC 260 USB MS II Headset - antonline.com
User manual Sennheiser EPOS Impact SC 260 USB MS II (English - 2 pages)
Amazon.com: Sennheiser SC 260 USB MS II (506483) - Single-Sided Business Headset | For Skype for Business, Softphone, and PC | with HD Sound, Noise-Cancelling Microphone (Black) : Sennheiser: Everything Else