The ZDC8-30M1-4G-2655 from COM-MW is a Bi-Directional Coupler with Frequency 1 to 4 GHz, Coupling 29.5 to 32.5 dB, Power 150 W, Insertion Loss 0.4 dB, Directivity 16 to 19 dB. Tags: Surface Mount. More details for ZDC8-30M1-4G-2655 can be seen below.