The WBLB-T-BP-3900-600-8C from A-Info is a Band Pass Filter with Frequency 3.6 to 4.2 GHz, Insertion Loss 1.5 dB, Rejection 70 dB, VSWR 1.50:1, Operating_Temperature -40 to 80 Degree C. Tags: Module with Connectors, Cavity Filter. More details for WBLB-T-BP-3900-600-8C can be seen below.