Solu &reg;Mifare Rc522 Card Read Antenna Rf Module Rfid Reader Ic Card Proximity Module/13.56mhz 14443a Mifare Rc522 Rf Rfid Writer Reader Ic Card with S50 for Arduino Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. About us (Solu ), Professional factory of circuit boards for Arduino.RC522 chip: The transmission module utilizes an outstanding modulation and demodulation concept comp RC522 chip: MF RC522 is a highly integrated transmission module for contactless communication at 13. RFID Module: The Module supply voltage is 3.3V, users can connect the module to any CPU board with t RFID Module: RFID Module with the Philips MF RC522 chip is used for RFID products development.