The QDDC-2000-4000-K5-40-N from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±2 dB, Frequency 2000 to 4000 MHz, Average Power 500 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for QDDC-2000-4000-K5-40-N can be seen below.