The UIYDI4557A from UIY Inc. is a RF & Microwave Isolator with Frequency 250 MHz to 1.5 GHz, Average Power Forward 100 to 300 W, Average Power Reverse 150 W, Insertion Loss 0.4 to 0.45 dB, Isolation 18 to 25 dB. Tags: Drop-In, Drop-In Isolator. More details for UIYDI4557A can be seen below.