Suggest adding a sound notification (for example high low tone beeps) to tell users when they have lost their connection with everyone, or when the connection has been re-established.

When I'm in a crowded city, the Bikom20 signal range can be really short, sometimes only around 100 meters. It's so annoying to keep losing the connection and having to ask the other person if they can hear me. It would be super helpful if there was a tone to let me know the connection is back.

Hope you can add this in the next firmware update. Thanks!