The DDTO-800/2200-40/30 from Shanghai Huaxiang Computer Communication Engineering is a Dual Directional Coupler with Coupling 40 dB (Forward), 30 dB (Reverse), Coupling Variation 1.2 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-800/2200-40/30 can be seen below.