The ISDJ-4 from MCLI is a RF & Microwave Isolator with Frequency 800 to 900 MHz, Average Power Forward 150 W, Insertion Loss 0.8 dB, Isolation 40 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for ISDJ-4 can be seen below.