The SiMF2R7/R4-6D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 2.55 to 2.95 GHz, Center Frequency 2.75 GHz, Insertion Loss 3.5 dB, Rejection 30 dB @2.25GHz&3.25GHz, 40 dB @2.12GHz&3.45GHz, 60 dB @DC~2GHz, 60 dB @3.7~7GHz, Upper Rejection 30 to 60 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF2R7/R4-6D3 can be seen below.