This is the very popular 2.4GHz XBee XBP24-AUI-001 module from Digi. The Pro series have the same pinout and command set of the basic series with an increase output power of 60mW!
Warning: Last items in stock!
These modules take the 802.15.4 stack (the basis for Zigbee) and wrap it into a simple to use serial command set. These modules allow a very reliable and simple communication between microcontrollers, computers, systems, really anything with a serial port! Point to point and multi-point networks are supported.
If you are looking for distance, this module combined with a large 2.4GHz antenna is just about the longest range there is. Better performance than the chip antenna because of the ability to add a higher-sensitivity antenna.
Not sure which XBee module or accessory is right for you? Check out our XBee Buying Guide!
Note: If you are using these outside of the United States, please check with your local laws regarding radio communication.