--- 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: "S/.1" currency: PEN in_stock: false reviews_count: 2 url: https://www.desertcart.pe/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic store_origin: PE region: Peru --- # 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:** S/.1 **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?** S/.1 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/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 Review: UID NOT modifiable/changeable - The description states that this card is UID rewritable; however, this is not true. I attempted to write a saved UID, which is my apartment key, using my Flipper Zero and the NFC Magic app. After writing, I scanned the card’s UID, and it remained unchanged, confirming that the UID cannot be modified. Review: Says programmed but doesn’t function, maybe I’m not smart enough - Copied key to a few and said written, but didn’t open any doors ## 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07QM1GWL6 | | Batteries required | No | | Best Sellers Rank | #543,289 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #292 in Commercial Access Cards | | Customer Reviews | 3.0 3.0 out of 5 stars (7) | | Item Weight | 1.13 ounces | | Item model number | XC233 | | Manufacturer | XCRFID | | Package Dimensions | 3.94 x 3.62 x 1.02 inches | ## 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 **Size** options. ## Customer Reviews ### ⭐ UID NOT modifiable/changeable *by N***R on January 3, 2025* The description states that this card is UID rewritable; however, this is not true. I attempted to write a saved UID, which is my apartment key, using my Flipper Zero and the NFC Magic app. After writing, I scanned the card’s UID, and it remained unchanged, confirming that the UID cannot be modified. ### ⭐ Says programmed but doesn’t function, maybe I’m not smart enough *by K***E on September 27, 2022* Copied key to a few and said written, but didn’t open any doors ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pe/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic](https://www.desertcart.pe/products/152469877-uid7b1k-s50-with-7-byte-uid-changeable-rewritable-smart-ic) --- *Product available on Desertcart Peru* *Store origin: PE* *Last updated: 2026-04-23*