The DDTO-2/3-10 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 10 dB, Coupling Variation 1 dB, Frequency 2 to 3 GHz, Average Power 100 W, Insertion Loss 1.3 dB. Tags: Module with Connectors. More details for DDTO-2/3-10 can be seen below.