A Xbee shield allows an Arduino board to communicate wirelessly using Bee compatible modules (like Zigbee or BlueTooth Bee). It is designed to be used with Xbee module from MaxStream. It can be used as a Serial Port / USB replacement. It is used to connect two Arduino using Zigbee / Bluetooth Bee or connect a Arduino with PC Wirelessly. Two toggle switches decides how Rxd and Txd pins of Bee modules be connected to Arduino pins. These two switches provides options to connect RxD and TxD lines of Bee Modules to Arduino Hardware Serial Port or Digital pins 11 and 12 or FTDI RxD and Txd Pins.