The ISDJ-21 from MCLI is a RF & Microwave Isolator with Frequency 11.7 to 12.7 GHz, Average Power Forward 10 W, Insertion Loss 0.4 dB, Isolation 46 dB, Operating Temperature -20 to 65 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for ISDJ-21 can be seen below.