You need a 9 volt to run a cold card?
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No it's just some silly overpriced CoinKite tchotchski you dump in ypur cart when you're ColdCard shopping. A little circuit with 9v terminals that can deliver power to your device.
I suppose the little board is stepping down the voltage to 5v, since it had a USB-A port.
Retarded design if it is just pumping 9v though.