The WTBCF5-3000-4000-40-100-40M-4 from Wainwright Instruments is a Tunable Filter with Frequency 3 to 4 GHz, Bandwidth 40 MHz, Rejection 40 dB, Insertion Loss 2 to 3 dB, Supply Voltage 23 to 32 V DC. Tags: Module with Connectors, Digitally Controlled. More details for WTBCF5-3000-4000-40-100-40M-4 can be seen below.