The T5BJ1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 5.4 to 5.9 GHz, Average Power 0.4 W, Average Power Forward 0.4 W, Peak Power 400 W, Insertion Loss 1.2 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T5BJ1 can be seen below.