50pcs 13.56MHz Rewritable UID RFID Keyfob Set

Reliable rewritable RFID keyfobs for efficient access control and card management

This 50-piece set of 13.56MHz rewritable UID RFID keyfobs is designed for professional use in access control, identification, and card management systems. Each keyfob contains a contactless IC chip that operates at 13.56MHz, the standard frequency used for many MIFARE 1K S50-type proximity and smart card applications. With programmable block 0 (UID), these keyfobs allow you to configure, clone, or replace compatible IC cards using a suitable RFID copier, writer, or duplicator.

The keyfobs function like standard 1K S50 IC cards, with the added flexibility that Sector 0, Block 0 (the usual serial number/manufacturer UID block) can be rewritten to a UID of your choice, when used with compatible equipment and software. This makes them useful for testing, maintenance, and deployment of RFID-based systems in offices, residential buildings, parking facilities, gyms, schools, warehouses, and healthcare environments. Each keyfob is housed in a durable plastic shell with a metal keyring hole, allowing easy attachment to keychains, lanyards, or ID holders.

The set is available in five colors: red, yellow, black, gray, and blue. When you select the mixed-color option, you receive 10 pieces of each color (10 blue, 10 gray, 10 black, 10 red, 10 yellow), helping you visually organize users, departments, or access levels. The compact form factor (approx. 3 cm body length) makes the fobs comfortable to carry while maintaining reliable read/write performance with compatible 13.56MHz RFID readers and writers.

Why It's a Smart Choice

• Supports rewritable block 0 UID for flexible cloning, replacement, and testing of compatible IC cards.
• Compatible with many 13.56MHz MIFARE 1K S50-type readers, copiers, writers, and duplicators used in access control systems.
• Includes 50 keyfobs with color options (or mixed colors) for easy user grouping and system organization.

FAQ

Q: What frequency do these keyfobs use?
A: They operate at 13.56MHz, commonly used for MIFARE 1K S50-type contactless cards and readers.

Q: Can I change the UID (block 0) on these keyfobs?
A: Yes. Sector 0, Block 0 is rewritable on these fobs when used with compatible RFID copier/writer hardware and software.

Q: Are these compatible with all access control systems?
A: They are suitable for systems that use 13.56MHz MIFARE 1K S50-type technology. Always confirm compatibility with your specific reader or controller before deployment.

Q: How many colors are included in the mixed pack?
A: The mixed pack includes 50 keyfobs: 10 blue, 10 gray, 10 black, 10 red, and 10 yellow.

Q: Can these be used outdoors?
A: The plastic housings are robust enough for daily use on keychains, but outdoor suitability depends on your environment and the protection level of your installed readers.