Coinkite

Mk5 keeps the Mk firmware family while updating the physical interface: a 1.54-inch Gorilla Glass display, redesigned tactile keypad, bottom-mounted USB-C, improved NFC, and a tougher case.

coldcard.com/docs/coldcard-…

COLDCARD Q adds a 50-key QWERTY keyboard, 320×240 display, QR scanner, two MicroSD slots, and power from three replaceable AAA cells. The security model remains dual-Secure-Element COLDCARD.

coldcard.com/docs/coldcard-…

SSSP can restrict single-sig spending by total value, transaction count and period, destination whitelist, and optional phone 2FA. The policy is enforced by COLDCARD during PSBT signing.

coldcard.com/docs/sssp/

Between two COLDCARD Q units, Key Teleport can transfer seeds, Secure Notes, full backups, short text, and multisig PSBTs as encrypted BBQr—without putting the payload on a server.

coldcard.com/docs/key-telep…

Address Explorer derives receive addresses on the signing device and shows their paths. Use it to cross-check the address displayed by a networked wallet before sending funds.

coldcard.com/docs/address-e…