The DDTO-800/2200-20/20 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 20 dB (Forward), 20 dB (Reverse), Coupling Variation 1 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-800/2200-20/20 can be seen below.