VOLT PLUS TECH USB C to 3.5mm Headphone Jack Audio Aux & C-Type Lightning Fast Charging Adapter Works for Sennheiser IE 80 S BTand Many More Devices with C-Port - Newegg.com
Quick Shot review 22: Sennheiser PC 135 USB headset
EPOS Adapt 165 USB II, USB-C, 3.5mm Double Sided Headset 1000916
Cable Techniques 18" Mini TRS to Low-Profile XLR-3M Sennheiser G4/G3 Output cable - TAI Audio
Amazon.com: Discover D315 Universal USB Adapter Compatible with Plantronics, Jabra and Sennheiser Wireless DECT Headsets | Allows Your Desk Phone Wireless Headset to Connect to A Computer : Electronics
Sennheiser CL 35 USB-C Locking 3.5mm TRS to USB Type-C 509262
Amazon.com: RJ9 Plug to USB Headset Adapter Compatible with Plantronics Jabra Sennheiser Wireless DECT Headsets for Use with Computers PC Laptop Mac Tablet Window Softphones Devices : Electronics