Nordic Semiconductor nRF24L01+. Transceiver chip operating in the 2.4GHz band. Take all the coolness of the nRF2401A and add some extra pipelines, buffers, and an auto-retransmit feature - very nice！ The improved '+' version of the nRF24L01 includes more features and better range！
Features
Drop in compatible with nRF24L01
1.9V-3.6V supply
2Mbit data rate
New long range 250kbit option
Auto acknowledge
Auto re-transmit
Multiceiver - 6 data pipes
32 byte separate TX and RX FIFOs
5V tolerant input pins
Software selectable channel from 2400MHz to 2525MHz（125 Selectable channels）
Minimum number of external components
Lots of application notes and support on Nordic Semiconductor Website
