The DDTO-2-50-23 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 50 dB, Coupling Variation 0.75 dB, Frequency 1.15 to 1.35 GHz, Average Power 500 W, Insertion Loss 0.35 dB. Tags: Module with Connectors. More details for DDTO-2-50-23 can be seen below.