Arduino Wireless SD Shield The Wireless SD shield allows an Arduino board to communicate wirelessly using a wireless Xbee module or similar plus a micro-SD card slot Included on board is a SD card slot. When using the SD Library to access the card, Pin 4 is CS and cannot be used otherwise. SPI also relies on pins 11, 12, and 13 for communication. The module can communicate up to 100 feet indoors or 300 feet outdoors (with line-of-sight).