Description: Bridge Series based on Arduino is a totally new and extremely hot product series, . Some of them are compatible to Arduino interface, and some others are designed for unique development environments. They are highly characteristic by the bridging role, bridging wireless communications, bridging to the Internet, bridging to various interfaces such as XBee, RF, SD card, NFC, WIFI and so on. WR Bridge V1.1 is a very unique Arduino board, mainly composed of SIM900 GSM / GPRS module, XBee socket, nRF24L01 + module, SD interface relay control module and ATMega328 control module. WR Bridge V1.1 is available to be applied to your projects to perform splendid functions together with wireless XBEE / nRF24L01 + module, controlling the robots and the electric equipment at home, supporting the SD card, storing information and data. Feature: Arduino controlling style Onboard GSM/GPRS Onboard XBEE socket Support Micro SD card(More than 2G is not guaranteed) Control relay module Easy to access reset button Gold plating Operating voltage: 7 VDC - 23VDC Note Bridge series does't have USB port for compiling, and you must use the provided UART interface. Of course, you can also choose to use the normal USB Adapter for compiling, but you must make sure of your USB Adapter with DTR signal pin. Due to this, we recommend the ElecFreaks Bluetooth Bee USB Adapter, which can perfectly function together with NX-bridge. Besides, Bee adapter itself is also very powerful, supporting both XBee and Bluetooth bee interfaces at the same time.