The Farpointe DK4-3 Key Fob uses both 13.56 MHz frequency with the Wiegand communication protocol.  These smart cards can be programmed to various formats and encryption keys.  

Features Include:

• Combines 13.56MHz contactless smart card with Wiegand 26 bit or custom formats
• 4K byte Memory  
• Read range up to .75 inches (19 mm) 
• Limited Lifetime Warranty
• Includes Programming to your specifications

Farpointe Data is the access control industry’s trusted global partner for premium RFID solutions, including proximity, contactless smart and long-range technologies. In need of an ISO/IEC 14443 compliant access identification solution? Delta Contactless Smartcard Readers and Credentials comprise an advanced radio frequency identification (RFID) solution optimized for electronic access control. Delta makes use of NXP Semiconductors’ MIFARE® technology, perhaps the leading industry standard for contactless smartcards with literally billions of devices sold worldwide. Delta also supports a wide range of third-party contactless 13.56-MHz smartcard-based credentials, as well as the entire range of Delta credentials. Benefits of 13.56-MHz Delta: . Optimized for MIFARE® DESFire® EV1 and EV2 high-security contactless smartcard support . Supports industry standard interfaces . Based upon the world-standard MIFARE® technology, ideal for ISO 14443 applications . Installs indoors or outdoors . Lifetime warranty on ALL readers.