The WTRCT10-2500-2570-20-40-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 2.5 to 2.57 GHz, Bandwidth 20 MHz, Insertion Loss 1.25 dB, Rejection 40 dB, Return Loss 14 dB. Tags: Module with Connectors, Cavity Filter, Notch Filter, Tunable Filter. More details for WTRCT10-2500-2570-20-40-40 can be seen below.