The DC4000U10-120 from Yantel Corporation is a Directional Coupler with Frequency 1.7 to 4 GHz, Coupling 11 to 14.5 dB, Directivity 13.8 to 20.1 dB, Average Power 4 W, Insertion Loss 0.55 to 0.85 dB. Tags: Surface Mount. More details for DC4000U10-120 can be seen below.