The 2.4 GHz XBee Starter Kit includes everything you need to set-up a wireless 802.15.4 network in a matter of minutes. The 1mW XBee OEM RF Modules make it simple to design and range test custom wireless networks. The XBee Starter Kit includes worldwide agency approvals and advanced networking features. 

The development kit includes:

(2) XBee 802.15.4 w/ Wire Antenna
(1) RS-232 Development Board
(1) USB Development Board
(1) RS-232 Serial Cable
(1) USB Cable
(1) 9V Battery Clip