The AMBEO Smart Headset from Apogee and Sennheiser now connects to Mac and iPad Pro using the new Anker USB-C to Lightning Audio Adapter
Sennheiser CMB01 QD to 3.5 mm TRRS (4-pole) Headset Adapter
Sennheiser Adapter 6,3S - 3,5S - - Adapter jack 6.3S - jack socket 3.5S
Amazon.com: Headset Combo Y-Adapter for Sennheiser PC 360 SE, PC 350, GSP 300, Game Zero and Game ONE Gaming Headsets Compatible with Xbox One, PS4 and Smartphone Adapter : Video Games
Buy EPOS|Sennheiser IMPACT SC 665 Duo USB-C and 3.5mm Corded Headset