The ZX30-12-4-S+ from Mini Circuits is a Directional Coupler with Frequency 5 to 1000 MHz, Coupling 12.0 dB, Coupling Variation ±0.5 dB, Directivity 13 to 35 dB, Average Power 0.5 to 1 W. Tags: Module with Connectors. More details for ZX30-12-4-S+ can be seen below.