The AM1542B556 from Anatech Electronics is a Band Pass Filter with Frequency 1.52 to 1.55 GHz, Bandwidth 34 MHz, Center Frequency 1542 MHz, Insertion Loss 1 dB, Upper Rejection 25dB @ 1625 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for AM1542B556 can be seen below.