There is no Biometric Device required, the device is your Mobile or Tablet
Navigate to Locations/Devices
Select the location you would like to associate the device to
Click on the icon under the device column in the selected location row
Click on the (+) sign at the most right of the screen
Enter name for your device, choose to bypass or apply the device restrictions, re-authentication period, and click on the green sign at the most left of the screen