Your 2-Step Verification Device is the device you will use for second step authentication every time you log in to a CalNet service.
You can set up multiple verification devices. In fact, we recommend that you enroll at least two verification devices so that you can still log in if you lose one.Choose a device that you have available every time you log in to CalNet, such as your smartphone.
Get more tips on doing the 2-Step here.
2-Step Verification Devices
Backup passcodes are useful in case you lose your phone or other verification device, or if you're in a location where cellular or WiFi service is weak. After registering your device, print out your backup passcodes.