Stam Support for WS4, WS6 headphones.

Turn your WS4 or WS6 headset into a remote control.
Attach the headset of your WS4 to your S TELESCOPIC stem and use it as a remote control. 

Note: don't forget to add a jack output adaptor for WS4, WS6, to connect to a wired headset.

If you use WS6 + WSA II or WSA II XL, you do not require a jack adapter. WS6 & WSA II will connect wirelessly.

https://www.detecnicks.co.uk/XP_WS4_Headphone_Adapto.html

https://www.detecnicks.co.uk/XP_WS6-ST_WSA-ST_Headphone_Adaptor.html