Módulo de escritura/lectura MF RC522 SPI para Arduino: SMZ-711RW Power: DC 9~15V Working frequency: 433MHz Receiving sensitivity: >-105dB Remote control distance: 50 metros (clearing without interference),this number is clearing to non- interference in the theoretical distance, because of the use of different environmental interference and walls to be reduced. Generally nominally about 10%-50% of the distance. tamaño: 49×41×22mm