Product overview These UID rewriteable 13.56 MHz S50 1k key tags provide a reliable, compact solution for copying, backing up, and reprogramming proximity card data. Sold as a pack of 10, each tag is designed to work with device copiers that support UID rewrite and sector zero writing, including compatibility with the ACR122UA9 device copier. Key benefits UID rewriteable and changeable: Allows rewriting of the unique identifier for legitimate replacement, testing, and system setup tasks. Writable sector zero and block: Supports writing to sector 0 and block 0 for full backup and restore operations when used with compatible copiers. Designed for backup and cloning workflows: Simplifies mass programming, card replacement, and cloning for authorized system maintenance. Pack of 10: Provides multiple units for batch programming, testing, or spare inventory. Main features Frequency: 13.56 MHz contactless operation. Chip type: S50 1k memory format. Functionality: UID rewriteable and writable sector 0 block 0 for GEN1 backup and restore. Form factor: Key tag style for easy carrying and direct use where tags are preferred over cards. Compatibility: Works with ACR122UA9 device copier and other readers/copiers that support UID rewrite and S50 1k programming. How this product solves problems Fast replacement of lost or damaged credentials: Program tags with existing access data for immediate reuse. Simplifies system testing and commissioning: Use rewriteable tags to simulate multiple users or scenarios without needing many physical cards. Streamlines backup and recovery: Create reliable backups of sector zero and block data for quick restoration during system maintenance. Typical applications Access control maintenance: Reprogram tags for authorized personnel when replacements are needed or to test access configurations. System development and testing: Developers and integrators can emulate different card UIDs and data for functional testing without multiple issued cards. Bulk programming and operations: Prepare multiple tags in batches for employee onboarding or event access management. What to check before use Ensure the target copier or reader supports UID rewrite and sector zero writing for S50 1k tags. Use appropriate programming software and follow authorized procedures for copying and restoring data. Confirm compatibility with your access control or reader hardware, including the ACR122UA9 device copier if applicable. Package contents Ten UID rewriteable 13.56 MHz S50 1k key tags, sold as a single lot. This product is intended for authorized, legitimate use such as system maintenance, testing, and legitimate replacement of credentials.