The QDDC-400-8000-K6 from Qualwave is a Dual Directional Coupler with Coupling 30 to 40 dB, Coupling Variation ±0.9 to ±1 dB, Frequency 400 to 8000 MHz, Average Power 600 W, Insertion Loss 0.7 dB. Tags: Module with Connectors. More details for QDDC-400-8000-K6 can be seen below.