The AM1880-1960D1004 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 5 W, Insertion Loss 3.2 to 3.4 dB. Tags: Surface Mount, Ceramic. More details for AM1880-1960D1004 can be seen below.