I’m working with an MK4 (and of course have steel too) so just looking for redundancy (and also forgot that the coldcard doesn’t automatically come with an SD card when I bought a second one)

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I have an MK4 too. I have a hard time with the NFC though. NFC works great with the tap signer, but not so much with the MK4.

I like using it with the Cold Power and a 9v battery though. It looks cooler, but the AAA batteries on the Q are easier.

Looove the ColdPower