The MR181 from Spectrum Control is a RF Mixer with RF Frequency 6000 to 18000 MHz, LO Frequency 6000 to 18000 MHz, IF Frequency 2 to 200 MHz, Conversion Loss 6.5 dB, LO Drive - Power 11 dBm. Tags: Module with Connectors, Double Balanced Mixer. More details for MR181 can be seen below.