These 5 RFID clips can be read and written via the RFID module (not included, see accessories). Specifications •13.56 MHz frequency • For NXP-RC522 Supplied • 5 RFID clips https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2017-08-05 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2018-01-25 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2021-04-28 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2021-06-17 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2022-06-23 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2022-10-31 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2023-04-16 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2023-09-03 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2024-04-24 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2024-07-04 https://elecena.pl/product/9696360/sbc-rfid-clip-development-boards-rfid-clip-for-module-rc522 2025-02-08