The 4BP1271-100-2A-PP from Quantic PMI (Planar Monolithics) is a Band Pass Filter with Frequency 1.22 to 1.32 GHz, Bandwidth 100 MHz, Center Frequency 1271 MHz, Insertion Loss 1.8 dB, Rejection 65dB @ 0 to 850MHz and 65dB @ 1680 to 6000MHz. Tags: Module with Connectors, Lumped Component Filter. More details for 4BP1271-100-2A-PP can be seen below.