The AM831-876D1011 from Anatech Electronics is a RF Duplexer with Frequency 814 to 849 MHz / 859 to 894 MHz, Band 1 814 to 849 MHz, Band 2 859 to 894 MHz, Power 3 W, Insertion Loss 3 dB. Tags: Surface Mount, Ceramic. More details for AM831-876D1011 can be seen below.