This is HID's Part #2050PNNMN is a 13.56 MHz iCLASS "contactless" smart chip with 125 kHZ proximity technology, all built into a KEYFOB. Includes 2k bits (2 Bytes) with Two (2) Application areas. It meets ISO 14443 Type A Standards.  This is Format #H10309 which has no facility code.  64Bit.  Numbering controlled by HID.