The Model 18531 from Microwave Filter Company is a Band Pass Filter with Frequency 1920 to 1980 MHz, Bandwidth 60 MHz, Center Frequency 1950 MHz, Insertion Loss 0.8 dB, Upper Rejection 25 to 85 dB @ 2000 to 2110 MHz, 2110 to 2170 MHz, 2170 to 5500 MHz. Tags: Module with Connectors. More details for Model 18531 can be seen below.