Trezor One is perhaps the most popular of all of our supported hardware devices.
Once you have set up your Trezor One for use with Casa, it's time to add it to Casa App and make it part of your multisig keyset.
Within Casa App, tap "Set up hardware key" and select "Trezor" and continue. Then, tap "Let's Go," then "Send email."
Casa will send you an email with a link you can use to add the Trezor device to your Casa Keyset. The email will be titled "Connect your device" and will come from firstname.lastname@example.org.
Click the link in the email, select "Trezor," and follow the on-screen instructions to add the device to Casa.
You'll then be directed to Trezor's website, where you will need to unlock the Trezor device, enter your PIN, and (optionally) your passphrase. Most people don't use a passphrase; if you don't use one, just click "Continue" at that step.
Follow the steps on Trezor's website, and you will be automatically directed back to the Casa window, and be notified that your device has been added successfully.
Casa App should automatically update to reflect that the Trezor has been added successfully.