The SK-2+ from Mini Circuits is a Frequency Multiplier with Input Frequency 1 to 500 MHz, Output Frequency 2 MHz to 1 GHz, Input Power 1 to 10 dBm, Harmonics 16 to 40 dBc, Conversion Loss 13 to 16 dB. Tags: Plug in. More details for SK-2+ can be seen below.