---
product_id: 344468667
title: "20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector"
brand: "cify"
price: "€ 28.77"
currency: EUR
in_stock: true
reviews_count: 7
url: https://www.desertcart.nl/products/344468667-20pcs-changeable-uid-smart-card-rewritable-13-56mhz-rfid-ic
store_origin: NL
region: Netherlands
---

# 13.56MHz freq 100k rewrites unique ID 20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector

**Brand:** cify
**Price:** € 28.77
**Availability:** ✅ In Stock

## Summary

> 🔑 Unlock Your Access Potential!

## Quick Answers

- **What is this?** 20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector by cify
- **How much does it cost?** € 28.77 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/344468667-20pcs-changeable-uid-smart-card-rewritable-13-56mhz-rfid-ic)

## Best For

- cify enthusiasts

## Why This Product

- Trusted cify brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **ISO Compliant:** Fully compliant with ISO/IEC 14443A protocol, ensuring global compatibility.
- • **Effortless Access:** Reading distance of up to 10cm (4 inches) for quick and convenient entry.
- • **Enhanced Security:** Each card features a unique encrypted ID, providing peace of mind for your access control.
- • **Seamless Compatibility:** Works flawlessly with all door access control systems, ensuring smooth operations.
- • **Unlock Limitless Possibilities:** With over 100,000 rewrites, this card adapts to your evolving access needs.

## Overview

The CIFYCIFY 20pcs Changeable UID Smart Card is a versatile and secure solution for door access control, featuring a rewritable design that supports over 100,000 uses. Operating at a frequency of 13.56MHz, these cards are compatible with various systems and offer a unique encrypted ID for enhanced security. With a reading distance of up to 10cm, they ensure quick access while adhering to ISO/IEC 14443A standards.

## Description

CIFY20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector

## Features

- ★Support read, write and copy, over 100, 000 rewrite times.
- ★Working frequency is 13.56MHz. Compatible with all kinds of door access control system.
- ★Each card with a unique encrypted ID number, can be changed.
- ★Suitable for 13.56MHz card reader and reading distance is 0-10cm (0-4inch).
- ★Fully compatible to MI-FARE Classic 1K,4-byte UID, 1K Byte memory, organized in 16 sectors of 4 blocks, compliant to ISO/IEC 14443A protocal.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | CIFY |
| Part Number | CIFY-20 UID |
| Product Dimensions | 8.5 x 5.4 x 0.1 cm; 130 g |
| Manufacturer reference | CIFY-20 UID |
| Colour | White |
| Item Package Quantity | 1 |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 130 g |

## Images

![20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector - Image 1](https://m.media-amazon.com/images/I/51xXeN0EWKL.jpg)

## Questions & Answers

**Q: Would these cards work with Net2?**
A: This card is writable 13.56MHz UID cards, used to copy 13.56MHz Mi-fare IC card.

**Q: Are these cards 1st or 2nd gen tags?**
A: This is 13.56MHz writable UID cards, can copy mi-fare 1k card.

## Customer Reviews

### ⭐⭐⭐ Poor Quality for Printing on
*by P***G on 31 May 2024*

Product is cheaply made, rfid warps the plastic coating on the outside and 12 out of 20 were scratched alreadyNot good for full cover id card printing, chip worked fine on 18 of them, one locked blank 😳 the other just doesn't work at all!

### ⭐ UID not writable
*by D***M on 15 December 2024*

Despite the claims in the listing, block 0 UID is not writable.You can only write 63/64 blocks

### ⭐ Not 2nd Gen with writable UID
*by R***N on 19 June 2024*

This was sold as writable UID and is not. Mifare tool tells me it is not a 2nd Gen tag after it fails to change Block 0

## Frequently Bought Together

- CIFY 20pcs Changeable UID Smart Card, Rewritable 13.56MHz RFID IC Blank Card for 1K S50 MF1 Mi-fare Door Access Control Block 0 Sector
- Jadeshay RFID Reader,NFC Reader/Writer ACR122U ISO 14443A/B RFID Card Reader + Free Software in White,Contactless Smart Card Reader Writer with USB Cable

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**Shop now:** [https://www.desertcart.nl/products/344468667-20pcs-changeable-uid-smart-card-rewritable-13-56mhz-rfid-ic](https://www.desertcart.nl/products/344468667-20pcs-changeable-uid-smart-card-rewritable-13-56mhz-rfid-ic)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-08*