Keycard Shell
Sale price
€135,50
Regular price
€156,51
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Keycard Shell
Sale price
€135,50
Regular price
€156,51
The air-gapped, modular hardware wallet. Slide a Keycard into Shell and get a full signing device with its own display, QR camera and replaceable battery. Fully open source. Fully verifiable.
In stock · Delivered in 7–10 days
Free worldwide shipping · 50+ countries
In the box
- 1× Keycard Shell
- 2× Keycard (black, no brand visible)
- 1× USB-C to USB-C charging cable
- 1× Standard replaceable battery (BL-4C type)
Key features
Air-gapped signing
Transactions via QR, never over USB. Shell never touches the internet or your computer's data bus.
Ethereum chains and Bitcoin
Compatible with 15+ wallets — MetaMask, Rabby, Ambire, Unisat, Sparrow, Status, and more.
Clear signing
Understand what you are signing on the Shell screen — transaction data in plain language, on a trusted display.
Unlimited Keycards
One Shell, infinite cards. Multisig, backups, family wallets — swap cards, switch identities.
Duress PIN
Under coercion, enter a separate PIN to open a decoy wallet with a different balance. Nothing visible to distinguish it.
EAL6+ certified secure element
The highest Common Criteria certification level — the same standard used in passports and bank cards.
Replaceable battery
Standard BL-4C type, available everywhere. Swap it anywhere. Never discard a device because the battery died.
Why buyers trust Shell
Works with 15+ wallets
MetaMask, Rabby, Ambire, Unisat, Sparrow, Status and more. No lock-in.
Endorsed by the builders
Safe, Dappnode and Cyfrin co-founders on record.
100% open source
Schematics, firmware, applets. MIT-licensed. Crowd-auditable, forever.
Counterfeit-proof
Can't be faked. Every device cryptographically proves its own authenticity.
Tech specs
| Display | 2-inch, on-device transaction view |
| Secure element | JCOP4 P71, EAL6+ |
| Signing | Air-gapped via QR (ERC-4527) |
| Camera | Yes, for QR signing |
| Battery | Standard BL-4C type, replaceable |
| USB | USB-C, data-transfer kill-switch |
| Cable | USB-C to USB-C, 30 cm |
| Open standards | BIP32, BIP39 (with passphrase support), SLIP39 |
| Open source | github.com/keycard-tech |
How to Shell
