The WBLB-T-BP-3900-200-5C from A-Info is a Band Pass Filter with Frequency 3.8 to 4 GHz, Insertion Loss 0.5 dB, Rejection 50 to 65 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-3900-200-5C can be seen below.