The QDDC-2600-3950-K4-10-NS from Qualwave is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation ±0.5 dB, Frequency 2600 to 3950 MHz, Peak Power 4000 W, Average Power 400 W. Tags: Module with Connectors. More details for QDDC-2600-3950-K4-10-NS can be seen below.