The C2-A57 from RD Microwaves is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±0.75 dB, Frequency 800 MHz to 2.17 GHz, Peak Power 3 KW, Average Power 1500 W. Tags: Module with Connectors. More details for C2-A57 can be seen below.