The SiMF2R5/R8-9D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.1 to 2.9 GHz, Center Frequency 2.5 GHz, Insertion Loss 3.5 dB, Rejection 30 dB @1.65GHz&3.4GHz, 40 dB @1.6GHz&3.5GHz, 60 dB @DC~1.1GHz, 60 dB @4~6.8GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF2R5/R8-9D2 can be seen below.