The VBFZ-4000-S+ from Mini Circuits is a Band Pass Filter with Frequency 3.5 to 4.5 GHz, Bandwidth 1000 MHz, Center Frequency 4000 MHz, Insertion Loss 1.39 to 2.19 dB, Rejection 20 dB @ 2550 MHz. Tags: Module with Connectors. More details for VBFZ-4000-S+ can be seen below.