AJAX 42852.90.BL Contactless Key Fob, 3-Piece, Black

Streamline access control and everyday security operations with the AJAX 42852.90.BL Contactless Key Fob, a 3-piece pack designed for fast, reliable arming and disarming. These AJAX key fobs use DESFire® contactless technology (ISO 14443) with 128-bit encryption, delivering best-in-class protection against cloning and unauthorized access—essential for commercial security, surveillance, and monitoring environments.

Each key fob can be assigned in the Ajax app with custom names and permissions, and a single Tag supports connection to up to 13 control panels for hybrid installations across offices, retail sites, or multi-tenant buildings. Administrators can revoke or restrict access instantly, and every mode change is recorded in the event log for compliance and incident review. With a service life of up to ten years and plug-and-play operation with KeyPad Plus, deployment is quick and low maintenance.

Ideal for IT managers, security integrators, and facility operators who need scalable, secure credentialing, this AJAX key fob 3-pack simplifies access control while improving auditability and operational efficiency. Add to your security setup to enhance monitoring and protect assets across your sites.

• Fast, contactless arming and disarming for staff and residents—present the fob to KeyPad Plus to change security modes without passwords.
• Enterprise-grade DESFire® encryption (ISO 14443) prevents cloning and protects sensitive access control and monitoring data.
• Pack of 3 key fobs lets facilities standardize credentials across multiple users or locations right out of the box.
• Manage access centrally: assign names, set permissions, and revoke rights in real time via the Ajax app with full event logging for audit trails.
• Long service life (up to 10 years) and compatibility with up to 13 control panels per tag reduce maintenance and simplify deployment.