The EMA4E2700P400D30D from ECHO Microwave is a Band Pass Filter with Frequency 2.5 to 2.9 GHz, Insertion Loss 2 dB, Rejection 30 dB @ 2300 MHz, Return Loss 12 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4E2700P400D30D can be seen below.