Live Performance Audio: what is an appropriate audio device?

[dmon56]

Live Performance Audio: what is an appropriate audio device? When Live Performance Audio is turned on during a meeting, there is a message displayed: "Live performance audio is on. Noise suppression is disabled and all software audio processing is off. Please use an appropriate audio device to avoid echo and feedback."  

What is considered an appropriate audio device? 

[user001]

USB audio interface + headphones. don't use open speaker + mic