The Grove 125kHz RFID Reader, which is one of the special products of the Grove series, is a module used to read EM4100 RFID card information in two output formats: Uart and Wiegand. It has a sensitivity with a maximum detection range of 7 cm.
This product, which operates at 125kHz and is an RFID reader, can be used within the Grove series and in a standard Arduino Uno.