Adafruit RFID / NFC Smart Ring - Size 10 - NTAG213

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.