This is a NFC Ring, connected to your SatsMobiBot
Lightning Wallet, which is available on Telegram. Important prerequisites:
When you order this card, please be sure to be connected to SatsMobiBot
on Telegram and to BitcoinVoucherBot
on Telegram. If you never used them before just go to it and run /start command. Your Telegram user must have a username set for the system to work properly, as well. Most common size is 11 for men.