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Dear Cat, All our models are electronic devices. It is not possible to create a HW device that is capable of signing transactions in a non-electronic way. Please, keep in mind that you need a Trezor device (for example Trezor Safe 3 which supports BTC and XRP) in order to use it for managing your cryptocurrencies. The Trezor device will generate you a wallet backup (also known as recovery seed) which works as a backup of all private keys that you store in the device. You can then use our metal solution Trezor Keep Metal for storing this wallet backup. Keep in mind that the wallet backup is the most important thing as it can be used to recover all your private keys if the Trezor device is lost, damaged or stolen. Thus it is even more important than the electronic device itself. However, the electronic device needs to be used first to generate this wallet backup and manage (securely receive, send) the cryptocurrencies. Simply put, Trezor device is a must, Trezor Keep Metal is optional. I can recommend checking the basic information on how the Trezor ecosystem works at https://trezor.io/learn. You can find a lot of interesting and mainly useful articles there. If you have any further questions or if anything is not clear, let us know.
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