Coin uses a low-power Bluetooth signal to communicate with the app. If you ever leave your Coin behind while buying coffee, your phone will receive a notification asking whether you left without remembering to take your card. A phone is not required to use the card, however. Search “비트코인환전֎〈텔레그램-coin2002〉✻가상화폐송금☂가상화폐송금☽가상화폐온라인거래소✿” from Slim Down Your Wallet with a Card That Does the Work of Eight Credit Cards

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Coin uses a low-power Bluetooth signal to communicate with the app. If you ever leave your Coin behind while buying coffee, your phone will receive a notification asking whether you left without remembering to take your card. A phone is not required to use the card, however.