The new version of XBee Shield is a standardized and stackable shield compatible with Arduino. You can easily stack any modules from the Bee series onto it, and build a wireless network for your project. In spite of that, it is also equipped with function of level conversion, which enables a double-way conversion between high& low IO levels. The reserved digital pins facilitate users to select TX/RX port using jumper caps. Feature Standardized shape design Can be configured by connecting UartSBee module to USB The DIN and DOUT pins can be connected with both UART and other digital pins（D2~D12） Enlarged space for your own development LED indicators For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=1375?cPath=132_134