The AD831-876D443 from Anatech Electronics is a RF Duplexer with Frequency 814 to 849 MHz / 859 to 894 MHz, Band 1 814 to 849 MHz, Band 2 859 to 894 MHz, Power 100 W, Insertion Loss 1.5 dB. Tags: Module with Connectors. More details for AD831-876D443 can be seen below.