The IS-4-1 from MCLI is a RF & Microwave Isolator with Frequency 1.5 to 3 GHz, Peak Power Forward 0.1 kW, Insertion Loss 0.9 dB, Isolation 15 dB, Operating Temperature 0 to 50 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for IS-4-1 can be seen below.