From the product page:
A minimalistic version of Digirig with the same audio code as regular model of the interface but without serial port.
- combines audio codec and PTT switch
- supports PTT by GPIO3 of CM108 audio codec
- supports VOX PTT by the tone on the unused right channel (experimental)
- works with all major OS flavors: Windows, MacOS and Linux
- uses a single TRRS connector compatible with existing Digirig audio cables
- growing collection of pre-made cables including popular Icom, Yaesu, Elecraft, Baofeng, Xiegu transceivers
- isolation can be easily added using inexpensive USB isolator dongle
Discussion and software configuration examples can be found in this thread.
If you are doing APRS, you need a hardware TNC or a software TNC/modem like soundmodem. Direwolf will communicate with soundmodem, for instance.
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