RFID / NFC Smart Ring - Size 12 - NTAG213 : ID 2806 : $44.95

Full Ceramic Waterproof 213 NFC Smart Ring for IOS Android With Functional Couple Jewelry NFC Ring Touch Sharing Smart NFC Ring - AliExpress

Full Ceramic Waterproof 213 NFC Smart Ring for IOS Android With Functional Couple Jewelry NFC Ring Touch Sharing Smart NFC Ring - AliExpress

NFC Smart Ring, NFC Multi-Function Smart Rings Magic Wearable Device for Mobile Phone, 6/7/8/9/10/11/12/13 inch Optional(8inch) : Electronics

NFC Ring

NFC TAG203 Ring - V1ntage - RFID & NFC Chip Implants and Biohacking products

NFC Smart Ring - RFID tag manufacturer

Adafruit Industries - 789 - NFC/RFID Controller Shield, Arduino, Breakout & Shield, I2C, 2.1x4.7x0.425 - RS

2806 RFID Transponder Tools RFID/NFC Smart Ring - Size 12 - NTAG213 : Clothing, Shoes & Jewelry

NFC TAG203 Ring - V1ntage - RFID & NFC Chip Implants and Biohacking products

Adafruit Industries - 789 - NFC/RFID Controller Shield, Arduino, Breakout & Shield, I2C, 2.1x4.7x0.425 - RS