This is a 5 pack of 125kHz RFID tags to be used with 125kHz RFID readers. Radio-frequency identification cards are used in many applications including item cataloging, key card access and animal tracking and identification. These cards are not reprogrammable, but each has it's own unique ID number that can be read from the reader. We suggest using the RFID Starter Kit with these tags. Or you can use any 125kHz reader that works with EM4001 formatted cards. Here are some more specifications for the RFID tags.
Dimensions: 2.13 x 3.35 x 0.03" (54 x 85.5 x 0.8mm)
Be sure to check out the RFID Starter Kit Quick Start Guide for more information on how to read the tags.
Enjoy your new radio-frequency identification cards. If you have any problems, feel free to contact SparkFun Technical Support at firstname.lastname@example.org