The RSF-869.000-2000-3030-TR-NS4 from Raltron is a Band Pass Filter with Frequency 868 to 870 MHz, Bandwidth 2000 kHz, Center Frequency 869 MHz, Insertion Loss 2.2 to 3.5 dB, Rejection 50 to 20 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-869.000-2000-3030-TR-NS4 can be seen below.