# Prerequisites

#### 1. A Compatible NFC Card

You need a physical card with a readable NFC chip. EtheLock relies on the unique hardware identifier (UID) of the chip, not the data stored within it.

* **Bank Cards:** Visa, Mastercard, American Express (Contactless enabled).
* **Transit Cards:** Metro passes, bus cards, or train passes.
* **Identity Cards:** Employee badges, student IDs, or secure access cards.
* **Other:** Hotel room keys or generic NFC tags.

Note: We do not read or store credit card numbers, expiration dates, or CVV codes. We interacts strictly with the public serial number of the chip to generate your key.

#### 2. The EtheLock Mobile App

Your smartphone acts as the bridge between your physical card and the Ethereum network.

* **iOS:** iPhone 7 or newer (running iOS 14+).
* **Android:** Most devices with NFC capabilities (running Android 8+).

#### 3. A Modern Web Browser

The dashboard uses advanced WebRTC protocols for peer-to-peer encryption.

* **Supported:** Google Chrome, Brave, Safari, Microsoft Edge, Firefox.
* **Network:** An active internet connection is required for blockchain interaction, though key generation happens locally.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.ethelock.xyz/2-quick-start/prerequisites.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.