Xbee shield + XBee PRO S2B
The Xbee module is a wireless module that uses ZigBee technology to communicate wireless with devices such as a arduino or microcontroller through a serial port, which enables the device to be connected to a ZigBee network very quickly.
This is a new 2.4G Xbee XBP24BZ7PIT-004J wireless transmission module from Digi. The Pro series has the same pin definition as the basic model, but with a stronger output power of -63mW. Its transmission distance can reach up to 3200 meters (outdoor open space) and transmission rate up to 250kbps. This module provides very reliable data transmission, any device with serial output can use this module for data transmission, support point-to-point and multi-point network transmission.