The LBF-GSM850-1 from Leader-MW is a Band Pass Filter with Frequency 869 to 894 MHz, Insertion Loss 1.2 dB, Upper Rejection 50 dB, Lower Rejection 50 dB, VSWR 1.30:1. Tags: Module with Connectors, Cavity Filter. More details for LBF-GSM850-1 can be seen below.