The AB1800B492 from Anatech Electronics is a Band Pass Filter with Frequency 1.75 to 1.85 GHz, Bandwidth 100 MHz, Center Frequency 1800 MHz, Insertion Loss 0.25 dB, Upper Rejection 70 dB 3500-3700 MHz. Tags: Module with Connectors, Cavity Filter. More details for AB1800B492 can be seen below.