The DCE50S-2-4-500 from ESJ Technology is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 50 dB, Coupling Variation ±1.5 dB, Directivity 20 dB, Average Power 500 W. Tags: Module with Connectors. More details for DCE50S-2-4-500 can be seen below.