Hello,
I buy one and I use it with a Raspberry PI / Direwolf and an handheld (UV-K5 Quansheng).
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The audio output is a 4 poles audio jack (TRSS).
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In direwolf.conf you just have to set something like :
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#
PTT CM108
#
PTT /dev/ttyUSB0 RTS
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The layout is on the board, but under the sticker, so you have to open the box carefully (it's clip by force, but it's fragile) :
1 - GND
2 - PTT
3 - RIG AF IN
4 - RIG AF OUT
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73's de Stephan F1UBL
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