The WTRCDB5-400-500-0.05-0.61-40-2 from Wainwright Instruments is a Tunable Filter with Frequency 0.4 to 0.5 GHz, Bandwidth 0.05 MHz, Rejection 40 dB, Insertion Loss 1 to 3 dB, Operating Temperature 15 to 45 Degrees C. Tags: Module with Connectors, Mechanically Controlled. More details for WTRCDB5-400-500-0.05-0.61-40-2 can be seen below.