The DDTO-2-40-23 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation 0.75 dB, Frequency 1.2 to 1.6 GHz, Average Power 1500 W, Insertion Loss 0.4 dB. Tags: Module with Connectors. More details for DDTO-2-40-23 can be seen below.