The QDDC-500-40000-20-10-K from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±0.9 dB, Frequency 500 to 40000 MHz, Average Power 20 W, Insertion Loss 5 dB. Tags: Module with Connectors. More details for QDDC-500-40000-20-10-K can be seen below.