The AM1900D778 from Anatech Electronics is a RF Duplexer with Frequency 1850 to 1910 MHz / 1930 to 1990 MHz, Band 1 1850 to 1910 MHz, Band 2 1930 to 1990 MHz, Power 2 W, Insertion Loss 3.4 dB. Tags: Surface Mount. More details for AM1900D778 can be seen below.