The AD1877-1957D283 from Anatech Electronics is a RF Duplexer with Frequency 1870 to 1885 MHz / 1950 to 1965 MHz, Band 1 1870 to 1885 MHz, Band 2 1950 to 1965 MHz, Insertion Loss 1 dB, Isolation 70 dB. Tags: Module with Connectors. More details for AD1877-1957D283 can be seen below.