The JIM3400T4200VM1 from JQL Electronics is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power Forward 20 W, Average Power Reverse 10 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Surface Mount, Surface Mount Isolator. More details for JIM3400T4200VM1 can be seen below.