The JIC3400T4200S1R from JQL Electronics is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power Forward 100 W, Average Power Reverse 1 W, Insertion Loss 0.4 dB, Isolation 23 dB. Tags: Module with Connector, Coaxial Isolator. More details for JIC3400T4200S1R can be seen below.