The XGS-4 from Synergy Microwave Corporation is a Frequency Multiplier with Output Frequency 4 to 16 GHz, Input Power 13 to 16 dBm, Conversion Loss 11 to 14 dB, Frequnecy 2 to 8 GHz. Tags: Surface Mount, Frequency Doubler. More details for XGS-4 can be seen below.