The SF2183E from Murata is a Band Pass Filter with Frequency 399.75 to 400.25 MHz, Bandwidth 0.25 MHz, Center Frequency 400 MHz, Insertion Loss 3 to 4 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2183E can be seen below.