By using Robomart Arduino UNO R3+XBEE Shield Starter Kit, we can use XBee module easily. Our entire goal for the XBee Kit is to make wireless communication simple. Using this kit, you can transmit remote sensor data, or send data from your computer to update a scoreboard, or drive a robot from your keyboard. UNO R3 now uses an ATMega16U2 instead of the ATMega8U2 chip. This allows for faster transfer rates and more memory. More 3.3V modules supported, such as Xbee module, Bluetooth module, RF module, GPRS module, GPS module, LCD5110 Backlight and so on, but the original version can only support 5V IO.