The TBF-4000-600-C6 from Talent Microwave Inc is a Band Pass Filter with Frequency 3.7 to 4.3 GHz, Bandwidth 600 MHz, Center Frequency 4000 MHz, Insertion Loss 1 dB, Rejection 55 dB. Tags: Module with Connectors, Cavity Filter. More details for TBF-4000-600-C6 can be seen below.