The AM1900D325 from Anatech Electronics is a RF Duplexer with Frequency 1920 to 1980 MHz / 2110 to 2170 MHz, Band 1 1920 to 1980 MHz, Band 2 2110 to 2170 MHz, Power 2 W, Insertion Loss 1.5 to 2 dB. Tags: Surface Mount, Ceramic. More details for AM1900D325 can be seen below.