The AM813-858D1083 from Anatech Electronics is a RF Duplexer with Frequency 806 to 821 MHz / 851 to 866 MHz, Band 1 806 to 821 MHz, Band 2 851 to 866 MHz, Power 4 W, Insertion Loss 2.5 dB. Tags: Surface Mount, Ceramic. More details for AM813-858D1083 can be seen below.