The RSF-869.000-4000-3030-TR-NS1 from Raltron is a Band Pass Filter with Frequency 867 to 871 MHz, Bandwidth 4000 kHz, Center Frequency 869 MHz, Insertion Loss 3.2 to 3.5 dB, Rejection 20 to 46 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-869.000-4000-3030-TR-NS1 can be seen below.