The HDF447.725M from Shoulder Electronics is a Band Pass Filter with Frequency 447.37 to 4487 MHz, Bandwidth 0.7 to 0.7 MHz, Center Frequency 447.725 MHz, Insertion Loss 1.7 dB, Power 0.001 W. Tags: Surface Mount, RF SAW Filter. More details for HDF447.725M can be seen below.