Undetectable MIFARE Classic® Compatible 1K - One Time Write UID

Undetectable MIFARE Classic® Compatible 1K - One Time Write UID

  • €4.99 €5.99

MIFARE Classic® 1K Compatible Blank UID tag - One Time Write UID

Need to make perfect, undetectable of MIFARE Classic® 1K Cards ?

Many access control systems / RFID readers are now able to detect "Chinese Magic" tags by sending the "Unlock Command" (0x40 / 0x43). If the badge replies, it is flagged as an imposter / clone and rejected.

Exclusive to Lab401 - Our tag allows the UID to be set one time only - and after that - the tag never responds to magic commands. This allows you to make undetectable, perfect clones.

Once the UID has been set, the tag acts as a normal card. You can change the data of the card as many times as required - we've tested up to 10,000 read/write cycles. 

Remember: This badge's UID can only be set one time.

These tags are red and in key ring form for convenience.

Feature Information Notes
Chipset MIFARE Classic® Compatible
Memory Size 1K
UID Size 4 Byte
UID Modifiable ✔️ One time only
Chip Generation Gen 2 OTW
Chipset Generation Guide

UID Type Unlock Required DirectWrite One Time Write Notes
UID Type
✔️ ✔️ UID can only be modified once!

Compatibility LibNFC Proxmark Android Notes
UID Writing ✔️ ✔️ ✔️ MifareClassicTool recommended for Android
Card Writing ✔️ ✔️ ✔️ Non-Block0 writing supported by all devices
Card Reading ✔️ ✔️ ✔️ Card reading supported by all devices


Not all 'Magic' cards are alike. There are many chipset types, each with different levels of reliability and functionality. Lab401 has spent years sourcing, testing and visiting factories to find the most reliable and flexible 'magic' cards on the market.


The UID of MIFARE Classic® Compatible 1K UID One Time Write tags is comprised of two parts: the UID itself, and the BCC. The BCC is a checksum value calculated from the UID. If the BCC is incorrect, tag will be rejected by the reader.

Most RFID tools, such as the Proxmark, LibNFC, MCT etc automatically calculate the BCC when the UID is modified. If you are modifying the UID by hand, it is vital that the BCC is correctly calculated.

Lab401 cannot provide support or refunds under any circumstances for cards that were 'bricked' due to incorrect UID/BCC configuration.


Where do you ship from?

All items are dispatched from our EU-based warehouse. You will receive a tracking number upon item dispatch. The address used on your purchase is printed as a label - please double check your address to avoid mistakes.

When will my order be dispatched?

Lab401 dispatches orders Monday - Friday.
All orders placed before 12PM GMT+1 will be dispatched the same day. All orders placed after this cutoff time will be dispatched the next business day.

For example:

  • An order placed Friday, 9AM GMT+1 will be dispatched the same day.
  • An order placed on Friday, 6PM GMT+1 will be dispatched Monday.
  • An order placed on Saturday will be dispatched Monday

For any questions, please contact customer support.

What shipping options are available?

We provide four types of shipping:

  • EU Standard Post
  • EU Express Post
  • International Standard Post
  • International Express Post

How are import duties / customs handled?

For all European Union destinations, all shipments are DDP - Delivered Duty Paid. This means all applicable VAT/TVA, shipping costs and customs fees are pre-paid. 
You will not be charged by the courier service / post office or customs.

For all destinations outside European Union, all shipments are DDU - Delivered Duty Unpaid. This means that your country's custom service impose a VAT/TVA/Import Duty on your shipment.

I am charged VAT ?

Lab401 (ETOILE 401 SAS) is an EU-Registered entity. VAT is applicable to purchases delivered within the EU, with exceptions for VAT Registered entities.  VAT is calculated at checkout. For your convenience, you can browse Lab401 with prices Including VAT and Excluding VAT.

Sales are contractual

Please note - a purchase is an explicit agreement of our terms and conditions. Any products refused by clients will not be refunded.

Delivery Protection

Is my delivery protected?

For orders over 250 Euro, Lab401 automatically provides door to door delivery protection.

Lab401 Delivery Protection means we remain fully responsible for the package right up to delivery. If the package is lost or damaged, the package can be immediately resent upon receipt of proof.

For orders less than 250 Euro full responsibility for the package is transferred to you at the moment of shipping. Any claims for loss or damage must be addressed directly with the delivery agency.

Delivery Protection for orders under 250 Euro can be purchased at checkout easily and cheaply.

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