Change your default mic, speaker, or camera
To select the mic, speaker, and camera you want Teams to use for calls and meetings, select Settings and more 
next to your profile picture at the top of Teams and then choose Settings > Devices.
Under Audio devices, pick the speaker and mic you want Teams to use by default.
Under Camera, select the camera you want Teams to use, and see a preview of that camera's video.
If you have multiple certified devices connected to your computer, you can set one as your secondary ringer, which means it'll ring when a call comes in. Answer incoming calls on any device—not just the ones that ring.
