The RSF-868.500-4000-3838-TR from Raltron is a Band Pass Filter with Frequency 866.5 to 870.5 MHz, Bandwidth 4000 kHz, Center Frequency 868.500 MHz, Insertion Loss 6.0 dB, Rejection 25 to 45 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-868.500-4000-3838-TR can be seen below.