From their documentation

It is strongly recommended to use a Google Coral. A $60 device will outperform $2000 CPU. Frigate should work with any supported Coral device from https://coral.ai

My bad I was thinking that coral was a SAASS... but anyway money goes to G*** so not the best...

I just did.. seem not to meet my need
it use an online G*** services to perform...

and it seem to be only available as a Docker ...

Thanks @Jayjader@jlai.lu

I've tried few android apps but none does what it claim

• WiFi Walkie Talkie different channel on device, with no way to change them, voice do not pass.
• two-way-walkie-talkie, voice do not transmit, and anyway not open-source apps
• Zello PTT Walkie Talkie, do not work on LAN, not open-source.