The T4XE1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4.4 to 5 GHz, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -10 to 70 Degree C. Tags: Module with Connectors, Coaxial Isolator. More details for T4XE1 can be seen below.