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
Sennheiser PCV 05 Combo Audio Adapter Dual 3.5mm For PC Mac PS4 | eBay
Sennheiser PCV 05 (pcv05-504518) Combo Audio Adaptor For PC, Mac