The 4BP425-50-2B-PP from Quantic PMI (Planar Monolithics) is a Band Pass Filter with Frequency 400 to 450 MHz, Bandwidth 50 MHz, Center Frequency 425 MHz, Insertion Loss 1.1 dB, Rejection 60dB @ 0 to 110MHz and 60dB @ 310 to 1500MHz. Tags: Surface Mount, Lumped Component Filter. More details for 4BP425-50-2B-PP can be seen below.