The WBLB-T-BP-4000-1000-11C from A-Info is a Band Pass Filter with Frequency 3.5 to 4.5 GHz, Insertion Loss 0.5 dB, Rejection 50 to 75 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-4000-1000-11C can be seen below.