The C4-30-100-500-S-25W from I.F. Engineering is a Directional Coupler with Frequency 100 to 500 MHz, Coupling 30 dB, Directivity 20 dB, Power 25 W, Average Power 25 W. Tags: Module with Connectors. More details for C4-30-100-500-S-25W can be seen below.