This is a compact and easy to use RFID reader module. The ID-2 is a smaller module requiring an external antenna. Hook up an antenna, power the module, hold up a card, and you'll get a serial string output containing the unique ID of the card.
- 5V supply
- 125kHz read frequency
- EM4001 64-bit RFID tag compatible
- 9600bps TTL and RS232 output
- Magnetic stripe emulation output
SFE Eagle Library has this part!