The QDDC-500-8000-K25 from Qualwave is a Dual Directional Coupler with Coupling 30 to 40 dB, Coupling Variation ±0.8 to ±0.9 dB, Frequency 500 to 8000 MHz, Average Power 250 W, Insertion Loss 0.7 dB. Tags: Module with Connectors. More details for QDDC-500-8000-K25 can be seen below.