RFM69HCW Wireless Transceiver - 915MHz (4-pack) Transmit power: -18dBm (0.016mW) to +20dBm (100mW) in 1dBm steps Receive sensitivity: down to -120dBm at 1.2kbps Bit rates (FSK): 1.2kbps to 300kbps Voltage range: 1.8V to 3.6V - Current consumption: 0.1uA sleep, 1.25mA standby, 16mA receive, 130mA transmit (max) Encryption: AES 128-bit (optional) - Packet buffer (FIFO): 66 bytes