The RF3319D from Murata is a Band Pass Filter with Frequency 868.45 to 869.45 MHz, Bandwidth 0.5 MHz, Center Frequency 868.95 MHz, Insertion Loss 2.2 to 4 dB, Power 0.01 W. Tags: Surface Mount, Ceramic, Surface Mount, RF SAW Filter, Ceramic Filter. More details for RF3319D can be seen below.