# Choosing a hardware device for Your Casa vault

## A hardware device stores a vault key offline, separate from your phone and internet. You'll need one before setting up your 3-key vault. If you're not sure which device to get, this article will help.

### **Supported hardware devices**

Casa currently supports the following hardware devices for use in your vault:

- Trezor - One, Trezor Model T, Trezor Safe 3, Trezor Safe 5
- Ledger - Nano S, Nano S+, Nano X, Flex, Stax
- Coldcard (Mk3 and above)
- Keystone Pro 2
- Passport by Foundation (Core)
- YubiKey - 5c NFC, C NFC (firmware version 5.5 or higher required)

**Note:** Not all devices are compatible with both BTC and ETH vaults. Keystone and Coldcard are compatible with BTC vaults only. For ETH vaults, use a Trezor or Ledger device. YubiKey integration is only supported on Windows 11 or later.

For more details, see: [Supported platforms and hardware device firmware](https://support.casa.io/knowledge/supported-platforms-and-hardware-device-firmware?hsLang=en)

### **Comparison at a glance**

| Device | Best for | Connects via | BTC | ETH | Price |
| --- | --- | --- | --- | --- | --- |
| **Trezor** | Beginners; included in Premium packages | USB (via computer) | ✓ | ✓ | $$ |
| **Ledger** | Widely used; good app ecosystem | USB (via computer) | ✓ | ✓ | $$ |
| **YubiKey** | Simplest setup; available from Casa | USB | ✓ | ✗ | $ |
| **Coldcard** | Advanced users; Bitcoin-only | USB / microSD card (air-gapped) | ✓ | ✗ | $$$ |
| **Keystone Pro 2** | Air-gapped; QR code signing | microSD card / QR code (no USB) | ✓ | ✗ | $$ |
| **Passport** by Foundation | Air-gapped; privacy-focused | microSD card / QR code (no USB) | ✓ | ✗ | $$$ |

### **What does "air-gapped" mean?**

Some devices (Coldcard, Keystone, and Passport) never connect directly to a computer or the internet. Instead, they sign transactions using QR codes or microSD cards, so the device is never exposed to an internet-connected machine during use. This is a higher level of security, but it also makes these devices more complex to use and set up.

### **Which device should I choose?**

- **If you're new to hardware devices:** Start with a Trezor or YubiKey. Both have straightforward setup processes and good documentation.

- **If you're a Standard member purchasing your own device:** Trezor and Ledger are the most common choices and have the broadest compatibility, including ETH vaults.

- **If you're a Premium member or Private Client:** Casa typically includes hardware devices in your onboarding package. Contact your Advisor before purchasing a device separately.

- **If you're an advanced user who wants maximum security:** Coldcard, Keystone, or Passport offer air-gapped signing and are popular among experienced Bitcoin users.

### **Where to buy**

Always purchase directly from the manufacturer or an authorized reseller. Never buy a used hardware device from a third-party vendor. It may have been tampered with before it reaches you.

- **Trezor:** [trezor.io](https://trezor.io/)
- **Ledger:** [ledger.com](https://www.ledger.com/)
- **YubiKey:** Available through the [Casa checkout](https://support.casa.io/knowledge/purchasing-a-yubikey?hsLang=en), or directly from Yubico at [yubico.com](https://www.yubico.com/)
- **Coldcard:** [coldcard.com](https://coldcard.com/)
- **Keystone:** [keyst.one](https://www.keyst.one/)
- **Passport:** [foundation.xyz](https://foundation.xyz/)