The WBLB-T-BP-3990-400/3-8C from A-Info is a Band Pass Filter with Frequency 3.79 to 4.19 GHz, Insertion Loss 3 dB, Rejection 60 to 100 dB, Power 50 W, VSWR 1.30:1. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-3990-400/3-8C can be seen below.