The QDDC-500-6000-K25-40-N from Qualwave is a Dual Directional Coupler with Coupling 39 to 41.5 dB, Frequency 500 to 6000 MHz, Average Power 250 W, Insertion Loss 0.5 dB, Directivity 10 dB. Tags: Module with Connectors. More details for QDDC-500-6000-K25-40-N can be seen below.