The DDTO-2-40C from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation 1.2 dB, Frequency 1 to 2 GHz, Average Power 400 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for DDTO-2-40C can be seen below.