The AM1227-1575D1021 from Anatech Electronics is a RF Duplexer with Frequency 1210.1 to 1245.1 MHz / 1557.9 to 1592.9 MHz, Band 1 1210.1 to 1245.1 MHz, Band 2 1557.9 to 1592.9 MHz, Power 5 W, Insertion Loss 4 dB. Tags: Surface Mount, Ceramic. More details for AM1227-1575D1021 can be seen below.