The SiMF2R85/R3-7D4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.75 to 2.95 GHz, Center Frequency 2.85 GHz, Insertion Loss 3 dB, Rejection 30 dB @2.4GHz&3.25GHz, 40 dB @2.3GHz&3.4GHz, 60 dB @DC~2GHz, 60 dB @4~6GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF2R85/R3-7D4 can be seen below.