Tap it with your phone to see the deposit address and current balance. If you wan to unseal and spend, the best (only?) mobile wallet that supports it right now is nunchuk. Install nunchuk, press the nfc button, tap the card.
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You can use any NFC card like these ones or the Bolt Cards with this guide.
If you also want to have full control of the server part, you can have a look at this
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Yea I got a bolt card as well haven’t had time to load it up. On my to-do list. Guess I could be cool to show off at a bitcoin meet up
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