The EMA4C1575P2E25B from ECHO Microwave is a Band Pass Filter with Frequency 1.57 to 1.58 GHz, Insertion Loss 2.5 dB, Rejection 25 to 35 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4C1575P2E25B can be seen below.