The IMM489491AA from 3Rwave is a RF & Microwave Isolator with Frequency 4.89 to 4.91 GHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.25 to 0.3 dB, Isolation 21 to 25 dB. Tags: Drop-In Isolator. More details for IMM489491AA can be seen below.