This ring could have used an embedded RFID/NFC transponder! NFC technology is a great way to interact wirelessly with projects. With the RFID/NFC Smart Ring, your ring can communicate with your smartphone, tablet, computer, and more! Containing two MiFare Ultralight C - NTAG 213's with 144 bytes of read/write memory, one is located inside, near the palm, and the other beneath the jewel.Use these tags to launch apps, unlock your phone, transmit a URL, or control an Arduino. This RFID/NFC Smart Ring boasts a 20mm inner diameter and is compatible with ISO 14443-3A MiFare Ultralight/NTAG readers. Ideal for a variety of NFC projects, it supports seamless communication within a short range, similar to Bluetooth but without the need for authentication. https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-01 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-03 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-08 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-10 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-13 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-23 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-25 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-11-28 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-12-03 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-12-11 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-12-14 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-12-19 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2025-12-25 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-02 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-10 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-13 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-15 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-18 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-23 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-26 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-29 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-01-31 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-02-03 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-02-06 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-02-11 https://elecena.pl/product/29469447/adafruit-rfid-nfc-smart-ring-size-10-ntag213 2026-02-19