The AB1880B637 from Anatech Electronics is a Band Pass Filter with Frequency 1.85 to 1.91 GHz, Bandwidth 60 MHz, Center Frequency 1880 MHz, Insertion Loss 1 dB, Upper Rejection 70 dB @ 1976 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1880B637 can be seen below.