ks0067 keyestudio RC522 RFID module
http://www.amazon.com/dp/B016KE9D2U
RFID module adopts the card reader circuit design of Philips MFRC522 original chip. It’s easy to use, low cost, and can be applied to users for advanced applications such as equipment development and card reader development. This module can be directly loaded into various reader molds. It uses a voltage of 3.3V. With a few wires and a SPI interface, it can achieve direct communication with user's any MCU main board.