The HDL-1-40-500/NF from MCLI is a Dual Directional Coupler with Coupling 40 dB, Frequency 0.1 MHz to 1 GHz, Average Power 500 W, Insertion Loss 0.45 dB, Directivity 20 dB. Tags: Module with Connectors. More details for HDL-1-40-500/NF can be seen below.