The SF2046B from Murata is a Band Pass Filter with Frequency 451.22 to 461.66 MHz, Bandwidth 5.22 MHz, Center Frequency 456.44 MHz, Insertion Loss 8 to 9.1 dB, Power 0.02 W. Tags: Surface Mount, Ceramic, Surface Mount, Ceramic Filter. More details for SF2046B can be seen below.