A good quality un-terminated curly cable with a moulded plug like the one in the image. This cable fits Icom airband radios like the IC-A25 and later with a side socket and has all the necessary conductors. Full wiring data is here.
Ideal as a replacement cable for headsets and speaker-mics or for connecting DIY audio devices.
CURLY-IP100
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Please note these measurements are nominal please get in touch if you require more precise specifications.