The QSDC-400-2700-K4-40-N from Qualwave is a Directional Coupler with Frequency 0.4 to 2.7 GHz, Coupling 40±1.2 dB, Directivity 20 dB, Average Power 400 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for QSDC-400-2700-K4-40-N can be seen below.