The CFMU501X820 from Cernex Inc is a Frequency Multiplier with Input Frequency 500 MHz to 1 GHz, Output Frequency 4 to 8 GHz, Output Power 20 dBm, Harmonics 5 dBc, VSWR 2.00:1. Tags: Module with Connectors, Active, Passive. More details for CFMU501X820 can be seen below.