An RFID Reader with PIN Code , from Orno.

XBee 6.3mW Wire Antenna - Series 2C ZigBee Mesh

This is the ID-20LA , very simple to use the RFID Innovations ID reader module. With a built-in antenna , the only protrusion is the 2mm pin spacer . Just power the module, use a 125kHz card , and get a serial chain output that contains the card's unique identification.

This is a simple three track magnetic card reader with serial output.