The BPF-1550C from RF Bay is a Band Pass Filter with Frequency 1500 to 1600 MHz, Bandwidth 100 MHz, Center Frequency 1550 MHz, Insertion Loss 1 to 1.2 dB, Upper Rejection 53 to 56 dB. Tags: Module with Connectors, Ceramic Filter. More details for BPF-1550C can be seen below.