Description :

915MHz base RFM69HCW Wireless Transceiver is found on the RFM69 Breakout
Operates in the unlicensed ISM (Industry, Science and Medicine) band for low-power, short-range, license-free radios
Ideal for building inexpensive short-range wireless networks for home automation, citizen science, etc.
Transmits at up to 100mW and up to 300kbps (can be changed to fit your application)
Can reach up to 500 meters or more in open air with full power and simple wire antennas
Uses SPI (Serial Peripheral Interface) to communicate with host microcontroller
Supports up to 256 networks with 255 nodes per network
Features AES encryption to keep data private
Transmits data packets up to 66 bytes long
SparkFun sells two versions: 915MHz for use in Americas and 434MHz for use in Europe, Asia, Africa

Specifications:

20 dBm - 100 mW Power Output Capability
High Sensitivity: down to -120 dBm at 1.2 kbps
•High Selectivity: 16-tap FIR Channel Filter
•Bullet-proof front end: IIP3 = -18 dBm, IIP2 = 35 dBm,80 dB Blocking Immunity, no Image •Frequency response
•Low current: Rx = 16 mA, 100nA register retention
•Programmable Pout: -18 to 20 dBm in 1dB steps
•Constant RF performance over voltage range of module
•FSK Bit rates up to 300 kb/s
•Fully integrated synthesizer with a resolution of 61 Hz
•FSK, GFSK, MSK, GMSK and OOK modulations
•Built-in Bit Synchronizer performing Clock Recovery
•Incoming Sync Word Recognition
•115 dB Dynamic Range RSSI
•Automatic RF Sense with ultra-fast AFC
•Packet engine with CRC-16, AES-128, 66-byte FIFO
•Built-in temperature sensor