This reader is perfect for projects with double authentication. During working hours, all you have to do is hold the RFID card up to the reader. Outside working hours, the employee must also enter the PIN code. The reader is also ideal for situations in which you generate one-time or temporary access codes for your visitors. The keyboard is illuminated, so you can install the device even in unlit rooms. 2N® Access Unit M Touch Keypad & RFID reads both 125 kHz and 13.56 MHz frequency cards.