RFM12
2.2V to 5.4V, Low power, Standby <0.3uA, Tuning free, FSK modulation, PLL and Zero IF, Fast PLL lock with 2.5KHz step, 115.2Kb/s, Differential antenna input, Automatic antenna tuning, Programmable receiver bandwidth, ARSSI/DRSSI, AFC/DQD, SPI interface RF Transceiver Module

RFM12B
2.2V to 3.8V, Low power, Standby <0.3uA, Tuning free, FSK modulation, PLL and Zero IF, Fast PLL lock with 2.5KHz step, 115.2Kb/s, Differential antenna input, Automatic antenna tuning, Programmable receiver bandwidth, ARSSI/DRSSI, AFC/DQD, SPI interface RF Transceiver Module

RFM12BP
500mW, 2.2V to 3.8V + 12V PA, Low power, Standby <0.3uA, Tuning free, FSK modulation, PLL and Zero IF, Fast PLL lock with 2.5KHz step, 115.2Kb/s, Differential antenna input, Automatic antenna tuning, Programmable receiver bandwidth, ARSSI/DRSSI, AFC/DQD RF Transceiver Module

RFM22
1.8V to 3.6V, 240MHz to 930MHz, FSK / GFSK / OOK modulation, -118dBm Sensitivity, -11dBm to +20dBm Configurable Ouput Power, Low power consumption, 1kb/s to 128kb/s, Ultra low power shutdown mode, Digital RSSI, AFC RF Transceiver Module

RFM23
1.8V to 3.6V, 240MHz to 930MHz, FSK / GFSK / OOK modulation, -118dBm Sensitivity, -8dBm to +13dBm Configurable Ouput Power, Low power consumption, 1kb/s to 128kb/s, Ultra low power shutdown mode, Digital RSSI, AFC RF Transceiver Module