The SF2472E from RFM Integrated Device is a Band Pass Filter with Frequency 869 MHz, Center Frequency 869 MHz, Insertion Loss 1 to 2.5 dB, Power 1.99 W (In Passband) & 15 dBm (In Stopband), Return Loss 20 to 24 dB (In Passband). Tags: Surface Mount, RF SAW Filter. More details for SF2472E can be seen below.