The DDTO-3-40-14Z from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 40 dB, Frequency 2.7 to 3 GHz, Average Power 500 W, Insertion Loss 0.5 dB, Directivity 20 dB. Tags: Module with Connectors. More details for DDTO-3-40-14Z can be seen below.