When an RFID tag comes in close proximity to the PhidgetRFID Read-Write, it reads the tag string so it can be used in your program. Writing custom tag strings to writable tags is also supported. RFID (Radio Frequency Identification) systems use data strings stored inside RFID tags to uniquely identify people or objects when their tags are scanned by an RFID reader. These types of systems are found in many applications such as passport protection, animal identification, inventory control systems, and secure access control systems. The PhidgetRFID Read-Write supports reading and writing in 3 protocols: EM4100/EM4102, ISO11785 FDX-B, and PhidgetTag. The 1024 has two digital outputs, labeled "+5V" and "LED". These work the same as any other Phidgets Inc. digital output, except that the "+5V" output has a higher current rating. You can use these outputs to turn on an LED or activate another circuit when a tag read has occured.