The C4XJ4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4 to 8 GHz, Average Power 1 W, Average Power Forward 1 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C4XJ4 can be seen below.