The KBK-7C4S from Synergy Microwave Corporation is a Directional Coupler with Frequency 1 to 1000 MHz, Coupling 11 dB, Coupling Variation ±0.5 dB (Flatness), Directivity 20 to 32 dB, Average Power 1 W. Tags: Module with Connectors. More details for KBK-7C4S can be seen below.