The SMI-0405 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 400 to 500 MHz, Average Power Reverse 2 W, Insertion Loss 0.5 dB, Isolation 18 dB, Operating Temperature 0 to 60 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for SMI-0405 can be seen below.