The LDDC-0.8/4.2-40N-600W from Leader-MW is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 0.8 to 4.2 GHz, Average Power 600 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for LDDC-0.8/4.2-40N-600W can be seen below.