I know that cold card is very advanced bitcoin only device. I just dont know how its advanced or better.
The coldcard has a very basic but therefore well done code. This makes it very hard to exploit, but also there is no support for many features that other wallets may have. Especially it is missing the altcoin support and it is just a simple OLED display. Still it gets the job done very well which is the most important feature to me.
I have a response from coinkite. They said:
Hi Danny,
Happy to help! The Mk4 comes as a stand alone unit. You can purchase the power-only usb-c cable, micro SD, and 9V batter adapter from our website but they are all sold separately. If you have any further questions, feel free to ask.
Best regards,