The WBLB-T-BP-3950-500/3-10C from A-Info is a Band Pass Filter with Frequency 3.7 to 4.2 GHz, Insertion Loss 2 dB, Rejection 50 to 65 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-3950-500/3-10C can be seen below.