The ZFM-4-S+ from Mini Circuits is a RF Mixer with RF Frequency 5 to 1250 MHz, LO Frequency 5 to 1250 MHz, IF Frequency DC to 1250 MHz, Conversion Loss 5.70 to 7.5 dB, LO Drive - Power 7 dBm. Tags: Module with Connectors, Double Balanced Mixer. More details for ZFM-4-S+ can be seen below.