The QDDC-0.004-700-K25-40-S from Qualwave is a Dual Directional Coupler with Coupling 40 dB, Coupling Variation ±1 dB, Frequency 4 kHz to 700 MHz, Average Power 100 to 250 W, Insertion Loss 0.45 dB. Tags: Module with Connectors. More details for QDDC-0.004-700-K25-40-S can be seen below.