The EMA4D2700P300C40D from ECHO Microwave is a Band Pass Filter with Frequency 2.55 to 2.85 GHz, Insertion Loss 1.5 dB, Rejection 40 dB @ 2200MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2700P300C40D can be seen below.