The RSF-881.500-25000-1109-TR-NS3 from Raltron is a Band Pass Filter with Frequency 869 to 894 MHz, Bandwidth 25 MHz, Center Frequency 881.5 MHz, Insertion Loss 1.6 to 2.0 dB, Rejection 65 to 27 dB. Tags: Surface Mount, RF SAW Filter. More details for RSF-881.500-25000-1109-TR-NS3 can be seen below.