This handy little kit will provide you with everything you need to start experimenting and includes the reader, a RFID Keyfob and a RFID Card.
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To use the module you will need to do some configuration and tinkering on your Raspberry Pi but we found lots of tutorials pop up when searching "rc522 raspberry pi".
The module itself connects to the Pi via SPI.
As with many products we recommend you get some handy jumper wires to connect the module to your Raspberry Pi, for direct connection between the Pi & the reader the Female to Female ones will be the ones you need.