XBee 802.15.4
Multipoint Wireless Networking RF Module

XBee 802.15.4 platform features:      
* Simple, out-of-the-box RF communications, no configuration needed
* Point-to-multipoint network topology
* 2.4 GHz for worldwide deployment
* Common XBee footprint for a variety of RF modules
* Industry leading sleep current of sub 1uA
* Firmware upgrades via UART, SPI or over the air