The RF3171D from Murata is a Band Pass Filter with Frequency 417.5 to 418.5 MHz, Bandwidth 0.5 MHz, Center Frequency 418 MHz, Insertion Loss 1.6 to 2.5 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for RF3171D can be seen below.