The SF2137E-1 from Murata is a Band Pass Filter with Frequency 867 to 871 MHz, Bandwidth 2 MHz, Center Frequency 869 MHz, Insertion Loss 2.7 to 3.5 dB, Power 0.025 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for SF2137E-1 can be seen below.