The QSDC-2000-4000-50 from Qualwave is a Directional Coupler with Frequency 2000 to 4000 MHz, Coupling 10±1 to 30±1 dB, Directivity 18 dB, Average Power 50 W, Insertion Loss 0.5 to 1 dB. Tags: Module with Connectors. More details for QSDC-2000-4000-50 can be seen below.