You can connect the Audigo mic to up to four iPhones or iPads but the mic can only be used with one device at a time.
To connect to an additional iOS device, you need to put the mic into pairing mode by holding down on the power button until the LED turns blue. This may take up to 20 seconds. While holding down the power button, the LED will go from white, to off, to white again, and finally blue after about 20 seconds.
Make sure the Audigo app on the previously paired device is closed (swipe up to close out of the app) then open the Audigo app on the new device, sign in, and tap Connect to pair with the mic.
You can now open and close the Audigo apps on each device to connect to the mic. The mic should connect automatically, but if not, just tap the mic icon in the upper right of the app and then tap Connect.