The CD-1-2000-4000-30-50-SF-SF-SF / 800057 from DETI Microwave is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 30 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity ±0.75 dB, Directivity 20 dB. Tags: Module with Connectors. More details for CD-1-2000-4000-30-50-SF-SF-SF / 800057 can be seen below.