The BC-003A-20B from UMCC is a Bi-Directional Coupler with Frequency 10 KHz to 30 MHz, Coupling 20 dB, Coupling Variation ± 1 dB, Average Power 2 W, Insertion Loss 2 to 2.5 dB. Tags: Module with Connectors. More details for BC-003A-20B can be seen below.