MIFARE DESFire EV2 4K Fob

MIFARE DESFire EV2 4K Secure Key Fob (Box of 25) The TAG-EV2 is a professional-grade, high-security contactless key fob designed for rigorous access control environments. Built on the MIFARE DESFire EV2 platform by NXP, this 4K fob provides hardware-level encryption and high-speed data transmission in a compact, rugged form factor that fits easily on any keyring. Unlike standard proximity tags, the TAG-EV2 is engineered for organizations that require a higher tier of security for building access, and closed-loop payment systems without the need for a traditional plastic card. Key Technical Specifications Product Number: TAG-EV2 Integrated Circuit (IC): MIFARE DESFire EV2 (NXP) Memory Capacity: 4 KB EEPROM Operating Frequency: 13.56 MHz (High Frequency) Communication Protocol: ISO/IEC 14443 A 1-4 compliant Data Transfer Rate: Up to 848 Kbit/s Security: AES-128 hardware cryptographic engine with Proximity Check Form Factor: Reinforced plastic key fob with stainless steel split ring Security and Performance Features 1. Enhanced Cryptography & Proximity Check The TAG-EV2 utilizes AES-128 encryption for authentication and data privacy. This chip version includes a "Proximity Check" feature, which helps protect against relay attacks by ensuring the fob is physically close to the reader during a transaction. 2. Scalable Multi-Application Support The EV2 architecture allows for a virtually unlimited number of applications on a single fob, restricted only by the 4KB memory capacity. This enables one device to handle office entry, parking gate access, and cafeteria loyalty programs simultaneously. 3. Ruggedized Durability Designed for daily use, the TAG-EV2 casing is built from high-impact ABS plastic. It is moisture-resistant and shockproof, making it a more durable alternative to PVC cards for users in active environments or outdoor job sites. 4. Infrastructure Compatibility The TAG-EV2 is backward-compatible with existing MIFARE DESFire EV1 reader infrastructure. This enables a phased security update, allowing organizations to deploy more secure credentials today while maintaining compatibility with legacy hardware. Technical Fact Sheet Feature Details Common Use Cases Enterprise Access Control, Transit, Government ID, Secure Micropayments Environmental Rating IP67/IP68 Equivalent (Waterproof and Dustproof) Write Endurance Minimum 500,000 cycles Data Retention Up to 10 years Operating Temperature -25°C to +70°C