The WTRCFV8-3600-4000-20-40-40 from Wainwright Instruments is a Tunable Filter with Frequency 3.6 to 4 GHz, Tunable Frequency 400 MHz, Bandwidth 20 MHz, Rejection 40 dB, Insertion Loss 1.5 to 2 dB. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCFV8-3600-4000-20-40-40 can be seen below.