The ZBSS-4G-S+ from Mini Circuits is a Band Pass Filter with Frequency 2000 to 6000 MHz, Center Frequency 4000 MHz, Insertion Loss 0.8 to 2.5 dB, Upper Rejection 20 to 90 dB, Lower Rejection 20 to 90 dB. Tags: Module with Connectors, Suspended Substrate Filter. More details for ZBSS-4G-S+ can be seen below.