The CFM0405X420 from Cernex Inc is a Frequency Multiplier with Input Frequency 4 to 5 GHz, Output Frequency 16 to 20 GHz, Output Power 15 dBm, Harmonics 7 dBc, VSWR 2.00:1. Tags: Module with Connectors, Active, Passive. More details for CFM0405X420 can be seen below.