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 “비트코인직거래𝄡〈텔레그램-coin2002〉𓆱𝄡✍가상화폐온라인거래소✚리플온라인거래소비트코인세탁” from Slim Down Your Wallet with a Card That Does the Work of Eight Credit Cards

Search “비트코인직거래𝄡〈텔레그램-coin2002〉𓆱𝄡✍가상화폐온라인거래소✚리플온라인거래소비트코인세탁”

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.