ColdCard Mk4 

Warning, the document is intentionally brief, to know more please refer to ColdCard - a taxonomy

Fourth continuation of the device. It boasts improved features and uses new firmware branch 5.x which is separate from ColdCard Mk1/2/3’s 4.x

Improvements

  • USB-C connector
  • Unlimited memory: no Bitcoin transaction size restrictions!
  • Expanded multisig capabilities: handle bigger, more complex transactions.
  • NFC-V compatible: tap to transmit all data types, including PSBTs, addresses, and XPUBs.
  • Protective sliding cover shields screen and keypad when not in use.
  • Two Secure Elements for even more security:
    • Many new and extensive duress PIN options (Trick PINs)
    • Two Secure Elements, two manufacturers; minimizes unknown vulnerability risks.
  • USB Virtual Disk Mode: emulates a 4MB disk when connected to macOS, Windows, iPhone, etc.
  • Tougher case: upgraded with new plastic and cleaner edges.
  • Faster processor and substantially higher memory capacity.

Newly uses STM32L4S5VIT6 SOC. Which is much more performant than Mk3.

The SEs in question are Microchip ATECC608A/B and Maxim DS28C36BQ+T

Source: https://coldcard.com/docs/coldcard-mk4