The IS-12 from MCLI is a RF & Microwave Isolator with Frequency 2.6 to 5.2 GHz, Average Power Forward 1 W, Peak Power Forward 0.1 kW, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for IS-12 can be seen below.