The C4-P4-411 from Pulsar Microwave is a Directional Coupler with Frequency 0.5 to 250 MHz, Coupling 19.5 dB, Coupling Variation ±0.5 dB, Amplitude Flatness 0.3 dB, Directivity 25 dB. Tags: Module with Connectors. More details for C4-P4-411 can be seen below.