The QDDC-4000-6000-10 from Qualwave is a Dual Directional Coupler with Coupling 10 to 40 dB, Coupling Variation ±1 dB, Frequency 4000 to 6000 MHz, Average Power 10 W, Insertion Loss 0.5 to 0.8 dB. Tags: Module with Connectors. More details for QDDC-4000-6000-10 can be seen below.