The DDTO-800/2200-50/30 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 50 dB (Forward), 30 dB (Reverse), Coupling Variation 1.2 to 1.3 dB, Frequency 800 MHz to 2.2 GHz, Average Power 400 W, Insertion Loss 0.3 dB. Tags: Module with Connectors. More details for DDTO-800/2200-50/30 can be seen below.