The RSF-921.500-13000-2015-TR from Raltron is a Band Pass Filter with Frequency 0.915 to 0.928 GHz, Bandwidth 13 MHz, Center Frequency 921.5 MHz, Insertion Loss 3.2 dB, Rejection 30 to 40 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-921.500-13000-2015-TR can be seen below.