http://tinyurl.com/n67ku7h
WYPH CC1101 Wireless Module SMA Antenna Wireless Transceiver Module for Arduino
Working voltage :1.8-3.6V
Operating frequency:(Module:387-464MHZ)
Instantaneous maximum working current: <30mA
Maximum transmit power: 10mW (+10dBm)
315/433/868/915MHZ ISM band