The EMA4F2595P50C50D from ECHO Microwave is a Band Pass Filter with Frequency 2.57 to 2.62 GHz, Insertion Loss 1.5 dB, Rejection 50 dB @ 2300 to 2400MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4F2595P50C50D can be seen below.