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The proxmark3 is a powerful Penetration Testing and Research and development RFID tool. It is designed to snoop, listen and emulate everything from Low Frequency (125kHz) to High Frequency (13.56MHz) tags. It can act as a reader, a writer and clone a RFID tag. It can eavesdrop on a transaction between another reader and a tag, analyze a signal to perform...
The RedBee RFID reader allows you to read EM41xx 125 kHz RFID tags. It has direct USB and wireless XBee serial interfaces (XBee not included). So you can connect to your computer via USB and start reading, or read across a network using an XBee.
This is a basic RFID tag that functions within the MIFARE Classic 1K guidelines. You can use these for all sorts of identification and sensing applications. The tag also has 1K of data storage which can be read and written from a compatible device.