Specifications:

On-board 3.3V LDO Regulator (3.3 to 7V supply allowed)
Reverse Polarized SMA Connector for external 2.4 GHz Antenna
Up to 100m Range at 250kbps with appropriate antenna
250kbps to 2Mbit Data Rate
Auto Acknowledge
Auto Re-Trasmit
Multiceiver - 6 Data Pipes
32 Byte seperate TX and RX FIFOs
5V tolerant input pins
Software selectable channel from 2400MHz to 2525MHz (125 Selectable channels)
Minimum number of external components
Pins broken out : VCC, CE, CSN, SCK, MOSI, MISO, IRQ, GND
Lots of application notes and support on Nordic Semiconductor Website