The ISDJ-5 from MCLI is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Average Power Forward 20 W, Insertion Loss 1 dB, Isolation 36 dB, Operating Temperature 0 to 50 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for ISDJ-5 can be seen below.