The AD899-944D281 from Anatech Electronics is a RF Duplexer with Frequency 890 to 909 MHz / 935 to 954 MHz, Band 1 890 to 909 MHz, Band 2 935 to 954 MHz, Insertion Loss 0.6 dB, Isolation 80 dB. Tags: Module with Connectors. More details for AD899-944D281 can be seen below.