This is a great little RFID Reader Module from Innovations, simillar to the ID models (the difference being no silicone protection on the back). If you need an inexpensive way to get started with RFID, this is a great little module. Just power the module, and it will read any RFID card within range.
It will output the cards ID in a serial string, which can easily be read by any microcontroller. The spacing on the pins is 2.54 mm, which means the module will directly fit on a breadboard.
Here is a great little tutorial we did, to help you get started with this module!