The QDDC-500-6000-K6 from Qualwave is a Dual Directional Coupler with Coupling 30 to 40 dB, Coupling Variation ±0.7 to ±0.8 dB, Frequency 500 to 6000 MHz, Average Power 600 W, Insertion Loss 0.6 dB. Tags: Module with Connectors. More details for QDDC-500-6000-K6 can be seen below.