The AM2312-2357D1019 from Anatech Electronics is a RF Duplexer with Frequency 2310 to 2315 MHz / 2355 to 2360 MHz, Band 1 2310 to 2315 MHz, Band 2 2355 to 2360 MHz, Power 3 W, Insertion Loss 2.5 dB. Tags: Surface Mount, Ceramic. More details for AM2312-2357D1019 can be seen below.