The AM837-882D1088 from Anatech Electronics is a RF Duplexer with Frequency 830 to 845 MHz / 875 to 890 MHz, Band 1 830 to 845 MHz, Band 2 875 to 890 MHz, Power 3 W, Insertion Loss 3.2 dB. Tags: Surface Mount, Ceramic. More details for AM837-882D1088 can be seen below.