The KDK-744S from Synergy Microwave Corporation is a Bi-Directional Coupler with Frequency 10 MHz to 1 GHz, Coupling 20 dB, Coupling Variation ±1 dB (Flatness), Power 1 W, Insertion Loss 0.4 to 1.5 dB. Tags: Module with Connectors. More details for KDK-744S can be seen below.