The RKK-4-442+ from Mini Circuits is a Frequency Multiplier with Input Frequency 900 MHz to 1.1 GHz, Output Frequency 3.6 to 4.4 GHz, Input Power 19 to 23 dBm, Harmonics 23 to 35 dBc, Conversion Loss 24.5 to 29 dB. Tags: Surface Mount. More details for RKK-4-442+ can be seen below.