The QDDC-2000-4000-10-10-S from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±1 dB, Frequency 2000 to 4000 MHz, Average Power 10 W, Insertion Loss 0.8 dB. Tags: Module with Connectors. More details for QDDC-2000-4000-10-10-S can be seen below.