---
product_id: 152469877
title: "UID7B1K S50 with 7 Byte UID Changeable Rewritable Smart IC Card for ACR122U-A9 Device Read Write (MF1K 7byte 5pcs) by XCRFID"
brand: "xcrfid"
price: "€ 1.06"
currency: EUR
in_stock: false
url: https://www.desertcart.sk/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic
store_origin: SK
region: Slovakia
---

# Compatible with ACR122U-A9 Standard Size 85 x 54 mm 7 Byte UID Changeable UID7B1K S50 with 7 Byte UID Changeable Rewritable Smart IC Card for ACR122U-A9 Device Read Write (MF1K 7byte 5pcs) by XCRFID

**Brand:** xcrfid
**Price:** € 1.06
**Availability:** ❌ Out of Stock

## Summary

> Unlock the Future of Access Control! 🔑

## Quick Answers

- **What is this?** UID7B1K S50 with 7 Byte UID Changeable Rewritable Smart IC Card for ACR122U-A9 Device Read Write (MF1K 7byte 5pcs) by XCRFID by xcrfid
- **How much does it cost?** € 1.06 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic)

## Best For

- xcrfid enthusiasts

## Why This Product

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

## Key Features

- • **📦 Value Pack:** Includes 5 rewritable smart IC cards for all your needs.
- • **📏 Perfectly Sized:** Standard dimensions ensure easy handling and integration.
- • **🔒 Enhanced Security:** Utilizes GEN3 Chip technology for reliable performance.
- • **🔄 Transform Your Access:** Easily change the UID for versatile applications.
- • **💻 Seamless Compatibility:** Designed exclusively for ACR122U-A9 devices.

## Overview

The UID7B1K S50 is a set of 5 rewritable smart IC cards featuring a 7-byte UID that can be easily modified using the ACR122U-A9 device. With a standard size of 85 x 54 mm, these cards are designed for seamless integration and enhanced security, making them ideal for various applications.

## Description

Please Kindly Noted : This card is GEN3 , And it ONLY supports the ACR122U-A9 device modify the UID number . We provide the PCSC Tool for ACR122U-A9 .  Description 7byte UID. Works exactly like the M1k Card, with 16 Sectors and 4 Blocks each Sector, but the Sector 0 Block Zero known as Manufacturers Block where the Chip UID is stored, can be re programmed to any UID you wish.Applications: - Loyalty - Ticketing - Identification - Access ControlSpecifications Rewrite Times: 100,000 times Modulation: ASK Manchester coding Read Distance: up to 8cm (depends on the antena size)Material: PVC Dimensions: 85 x 54 x 0.84±0.02 mm

## Features

- Please kindly noted : It only supports the ACR122U-A9 device modify the UID number!
- UID7B1K S50 with 7 byte UID Changeable Rewritable Smart IC Card
- It ONLY supports the ACR122U-A9 device read write . Through PCSC Card Tool . It doesn't support other device to modify the UID number !
- GEN3 Chip , UID7B1K with 7 Byte UID Changeable Card, Standard Size 85 x 54 x 0.84±0.02 mm
- Package Included : 5PCS UID7B1K S50 with 7 byte UID Changeable Cards

## Images

![UID7B1K S50 with 7 Byte UID Changeable Rewritable Smart IC Card for ACR122U-A9 Device Read Write (MF1K 7byte 5pcs) by XCRFID - Image 1](https://m.media-amazon.com/images/I/41JMe7U5SBL.jpg)

## Available Options

This product comes in different **Capacity** options.

## Frequently Bought Together

- UID7B1K S50 with 7 Byte UID Changeable Rewritable Smart IC Card for ACR122U-A9 Device Read Write (MF1K 7byte 5pcs) by XCRFID
- Writable Dual chip UID Changeable MF1 1K with 125_LF T5577 Rewritable ID/IC Card for Copy Clone Backup

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**Shop now:** [https://www.desertcart.sk/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic](https://www.desertcart.sk/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-25*