The WTRCFV8-3550-3950-20-40-40-1 from Wainwright Instruments is a Tunable Filter with Frequency 3.55 to 3.95 GHz, Bandwidth 20 MHz, Rejection 40 dB, Insertion Loss 1.5 to 2 dB, Operating Temperature 15 to 45 Degrees C. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCFV8-3550-3950-20-40-40-1 can be seen below.