The T5BF1 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, Insertion Loss 2 dB, Isolation 25 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T5BF1 can be seen below.