The RF1172D from Murata is a Band Pass Filter with Frequency 433.42 to 434.42 MHz, Bandwidth 0.5 MHz, Center Frequency 433.92 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 RF1172D can be seen below.