Our grey Ops MIFARE DESFIRE EV1 4K tokens with clip are designed for high security access control. These high-frequency tokens operate at the 13.56MHz frequency and are compatible with PAC's High-frequency, Multi-Technology, and Architect readers. With a lifetime warranty against electronic failure, these tokens offer a reliable and secure alternative to traditional mechanical keys. Plus, they can be easily attached to keyrings and lanyards for user convenience.High-security access controlCompatible with PAC High-frequency, Multi-Technology, and Architect readersLifetime warranty against electronic failure