Premium Blank White PVC Cards with Hi-Co Mag Stripe (4000oe), 760 Micron, CR80, Printable - Pack of 500Operating at a frequency of 125kHz, EM4102 is a read only proximity chip, with a built in 64 bit identifier. This identifier number can be interpreted in various ways but is the only data stored on these cards, which do not offer any user memory, making EM4102 an easy to use, low cost proximity card option with various applications, including access control, inventory management, hotel keys and animal identification. Constructed in a similar method to