The AM457S144 from Anatech Electronics is a Band Pass Filter with Frequency 454.6 to 459.4 MHz, Bandwidth 4.8 MHz, Center Frequency 457 MHz, Insertion Loss 1.9 to 2.8 dB, Upper Rejection 27 dB 470-1700 MHz. Tags: Surface Mount, RF SAW Filter. More details for AM457S144 can be seen below.