The ZX30-12-4+ from Mini Circuits is a Directional Coupler with Frequency 5 MHz to 1.2 GHz, Coupling 11.82 to 12.37 dB, Directivity 16.05 to 37.2 dB, Power 0.5 to 1 W, Average Power 0.5 to 1 W. Tags: Module with Connectors. More details for ZX30-12-4+ can be seen below.