The DDTO-1-30 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 30 dB, Frequency 500 MHz to 1 GHz, Average Power 500 W, Insertion Loss 0.3 dB, Directivity 20 dB. Tags: Module with Connectors. More details for DDTO-1-30 can be seen below.