I've tested the "voice call" feature of the C200 from the app.
When I say "hello" into my phone, after a short delay I can hear my own voice back on the phone.
Meaning, I say Hello, the C200 speaker says Hello, then the C200 microphone picks up the Hello I just emitted (that's the problem), and it is played back to me on my phone.
This is then followed by a few echo sounds.
I was definitely in a room far away, to be clear.
Aren't microphones supposed to filter out sounds emitted by the same device? Is this a bug? Or something I have to live with?