Shop | StarTech.com 4 Position Microphone and Headphone Splitter 3.5 mm 4 Pin / 4 Pole Mic and Audio Combo Splitter Cable (MUYHSMFFADW) - headset splitter - 6 in
10 Pcs 6.35mm Stereo Socket 4 Pins Headphones Jack PCB Panel Mount Connectors - Walmart.com
Amazon.com: Eartec Max 4G Single-Ear Midweight Headset with Mic and 4-Pin XLR Female Connector for Pro Audio Radios : Electronics
Eartec Single Muff 4-Pin Headset Headphones w/ Mic | eBay
Clear-Com CC-110-X4 Lightweight Single On Ear Intercom Headset with Dynamic Mic and Four-pin Female XLR connector
Amron Deluxe Headset with Boom Mic and 4 Pin Audio Connector with 25 Foot Straight Cable 2401-31R-25
Point Source ADP-PHX4F Adapter Cable with 3.5mm TRRS to 4-pin Female XLR - ProAudio.com