The 4245B-10 from Narda-MITEQ is a Directional Coupler with Frequency 4 to 12.4 GHz, Coupling 10 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.4 dB, Directivity 16 dB. Tags: Module with Connectors. More details for 4245B-10 can be seen below.