The CU4S0506BT-881-00 from TDK is a RF & Microwave Isolator with Frequency 869 to 894 MHz, Bandwidth 25 MHz, Average Power Forward 5 W, Average Power Reverse 2 W, Insertion Loss 0.75 dB. Tags: Surface Mount, Surface Mount Isolator. More details for CU4S0506BT-881-00 can be seen below.