The EMA4D2570P300D25B from ECHO Microwave is a Band Pass Filter with Frequency 2.42 to 2.72 GHz, Insertion Loss 2 dB, Rejection 25 dB @ 2180 MHz, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2570P300D25B can be seen below.