> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# RFID / NFC Smart Ring - 18mm Diameter - NTAG213

**Type:** Product page · **SKU:** ADA2802 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/rfid-nfc-smart-ring-18mm-diameter-ntag213.html ([markdown](https://core-electronics.com.au/rfid-nfc-smart-ring-18mm-diameter-ntag213.html.md))

What did Lord Sauron, when forging the One Ring in the fires of Mount Doom forget to include in his all powerful ring? What did he forget to leave out of the ring impervious even to dragon fire, designed to rule over all free peoples of Middle Earth in perpetuity - a ring destined to be the One Ring to Rule Them All, to tempt its wearer with the promise of infinite power? Thats easy - it could have used an embedded RFID/NFC transponder!

## Pricing

- **Price:** $79.30 (inc GST) — $72.09 AUD, exc GST
- **Quantity discounts:** 10+ $69.93 (exc GST) · 50+ $68.49 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=ADA2802:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/ADA2802:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

What did Lord Sauron, when forging the One Ring in the fires of Mount Doom forget to include in his all powerful ring? What did he forget to leave out of the ring impervious even to dragon fire, designed to rule over all free peoples of Middle Earth in perpetuity - a ring destined to be the One Ring to Rule Them All, to tempt its wearer with the promise of infinite power? Thats easy - it could have used an embedded RFID/NFC transponder!

NFC (near field communication) technology is a great way to interact wirelessly with projects. With the **RFID/NFC Smart Ring** your ring can communicate with your smart phone/tablet, computer, or much more! **Contains a MiFare Ultralight C - NTAG 213** with 144 bytes of read/write memory. Use it to launch apps, unlock your phone, transmit a URL, control an Arduino, etc.

**This is RFID/RFID Smart Ring with a 18mm Inner Diameter.**

NFC is a way for two devices very close to each other to communicate. Sort of like a very short range bluetooth that doesn't require authentication. It is an extension of RFID, so anything you can do with RFID you can do with NFC. Because it can read and write tags, you can always just use this for RFID-tag projects. This ring can be read by any NFC/RFID reader with ISO 14443-3A MiFare Ultralight/NTAG support (which is pretty much all of them), including Adafruit's PN532 readers and various tablets and phones.

Learn more about RFID / NFC products and projects on the [Adafruit Learning System](https://learn.adafruit.com/category/rfid-slash-nfc).

**Technical Details**

- Inner Diameter: 18mm / 0.7"
- Outer Diameter: 23mm / 0.9"
- Thickness: 2.5mm / 0.1"
- Weight: 4.5g

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/a/d/ada2801-01_1.jpg)