The AD1855-1935D239 from Anatech Electronics is a RF Duplexer with Frequency 1850 to 1860 MHz / 1930 to 1940 MHz, Band 1 1850 to 1860 MHz, Band 2 1930 to 1940 MHz, Power 4 W, Insertion Loss 1 dB. Tags: Module with Connectors. More details for AD1855-1935D239 can be seen below.