The 4BJ10-12740/U12-O/O from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 1263 to 1285 MHz, Bandwidth 22 MHz (1dB), Center Frequency 1274 MHz, Upper Rejection 40 dB, Lower Rejection 40 dB. Tags: Cavity Filter. More details for 4BJ10-12740/U12-O/O can be seen below.