The WBLB-T-BP-3500-1000/3-7C from A-Info is a Band Pass Filter with Frequency 3 to 4 GHz, Insertion Loss 1 dB, Rejection 40 dB, VSWR 2.00:1, Operating_Temperature -20 to 70 Degree C. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-3500-1000/3-7C can be seen below.