The BP42R1227S20B from Sangshin is a Band Pass Filter with Frequency 1194.5 to 1259.5 MHz, Bandwidth 65 MHz, Center Frequency 1227 MHz, Insertion Loss 1.5 dB, Upper Rejection 17 dB. Tags: Surface Mount, Dielectric Filter. More details for BP42R1227S20B can be seen below.