Headset Adapter for P2 to Retevis Headset

Headset Adapter for P2 to Retevis Headset
Source: Dave Krum

Parts List (All parts listed were ordered from Amazon)
1ea Retevis p/n FC9009A5 Headset
1ea Fancasee US-CAB-11 2.5mm 3 pole female to bare wire jack
1ea Fancasee US-CAB-05 3.5mm 3 pole female to bare wire jack
1ea RIIEYOCA RII-296 3.5mm 4 pole male to bare wire plug
Shrink tubbing

You will need shrink tube or something to cover the individual wire joints. I also covered the finished joint with shrink tube. Electrical tape could be used but shrink tube works better. If you’re using shrink tube, make sure you put the tube on before soldering your connections. I cut the wires shorter for convenience and tinned the ends. I then soldered the wires according to the following table.

3.5mm Jack   3.5mm Plug
Black        White
White        Black

2.5mm Jack   3.5mm Plug
Black        Green
Red          Red

I put a large piece of tubing on the 3.5mm plug wire before starting and put heat shrink tube on each of the wires and shrunk down as I went and. I cut off the unneeded wires and pulled the larger shrink tube over the finished connections and shrunk it in place. Note: yup my tub does not cover the whole joint. I only had some short pieces☹.

My original idea was to cut the connector off the headset and connect the wires directly to the wire on the 3.5mm plug, but the headset wires have fine copper wires intertwined with nylon thread and I was unsuccessful in separating the two. The plugs and jack come in packs of 2 or 4. The biggest expense was the headsets. I could only find them in a 5 pack for $40. Breaking it down the cost was about $20 including the headset.