I have a new Bose A20 headset non Bluetooth for sale new in box. It has a U174 connector and also included is a U174 to 2 plug converter (not just adapter). There are both helicopter and fixed wing at my airport so I was planning to dabble in both. A flight instructor at the airport uses the exact same headset and converter for helicopter and fixed wing so I know the setup works well. I just bought exactly what he had. Now unfortunately I have to relocate out of the country for work so I must sell my equipment. $850 shipped for both new