The X4C25K1-04S from TTM Technologies is a Directional Coupler with Frequency 2.2 to 2.8 GHz, Coupling 3.9 dB, Coupling Variation ±0.35 dB, Average Power 10 W, Insertion Loss 0.25 dB. Tags: Surface Mount. More details for X4C25K1-04S can be seen below.