combines audio codec and PTT switch supports PTT by GPIO3 of CM108 audio codec supports VOX PTT by payload or tone on the unused right channel works with all major OS flavors: Windows, MacOS, Linux, iOS and Android uses a single TRRS connector compatible with existing Digirig audio/PTT cables growing collection of pre-made cables including popular Icom, Yaesu, Elecraft, Baofeng, Xiegu transceivers
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