SOLO-H (Helicopter) Aviation Headset USB Adapter - Flight Sounds Ltd
Amazon.com: Rugged Carbon Fiber Behind The Head Headset and Adaptor Cable for Intercoms – Features 5-Pin to Off Road Coil Cord and Volume Control Knob 3.5mm Input Jack : Electronics
Pilot USA Dual GA Headset Recording Adapter For GoPro Hero 3 / 3+ / 4 PA-80S/Hero3 | Pilotshop.com
Amazon.com: Rugged Radios H22-STX Carbon Fiber Over The Head Ultimate Headset for Stereo and Off Road Intercoms - Features Gel Ear Seals Cloth Ear Covers Noise Cancelling Microphone and Adaptors : Electronics
2Talk Intercom Headsets for Boaters (pair) - Marinebeam
Intercom / Radio Splitter for Helicopter / In-Vehicle Intercom Systems – Comm Gear Supply