The dormakaba 12640-P27-BK key fob is a reliable 125kHz proximity credential designed for use in legacy and cost-effective access control systems. Utilizing standard 125kHz prox technology, this fob delivers consistent read performance and broad compatibility with dormakaba and other industry-standard proximity readers. Commonly deployed in parking access, perimeter entry, and commercial or multi-tenant environments, the 12640-P27-BK offers a simple and dependable solution for facilities maintaining existing prox-based infrastructure. Its durable, compact design makes it ideal for everyday use in high-traffic applications. For organizations seeking to replace or expand their credential inventory without upgrading to smart card technology, this proximity fob provides a proven, budget-friendly option with seamless system integration.