The CDM-20M-4G from Crane Aerospace & Electronics is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±1.25 dB, Frequency 2600 to 5200 MHz, Average Power 50 W (CW), Insertion Loss 0.5 dB. Tags: Module with Connectors. More details for CDM-20M-4G can be seen below.