The CBF01018555B from Cernex Inc is a Band Pass Filter with Frequency 1.55 to 1.57 GHz, Bandwidth 12 MHz, Insertion Loss 8.5 dB, Upper Rejection 55 dB at 1.59GHz, Lower Rejection 65 dB at 1.53GHz. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CBF01018555B can be seen below.