The JIC0250T0300S1 from JQL Electronics is a RF & Microwave Isolator with Frequency 250 to 300 MHz, Average Power Forward 10 W, Average Power Reverse 10 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for JIC0250T0300S1 can be seen below.