The SDC360440-10 from Synergy Microwave Corporation is a Bi-Directional Coupler with Frequency 3.6 to 4.4 GHz, Coupling 8.6 dB, Coupling Variation ±0.25 to 0.6 dB (Flatness), Power 10 W, Insertion Loss 0.7 to 1.4 dB. Tags: Surface Mount. More details for SDC360440-10 can be seen below.