The 685-200400-020 from M2 Global Technology is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 20 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity ±0.75 dB, Directivity 22 dB. Tags: Module with Connectors. More details for 685-200400-020 can be seen below.