The EMA4F2442P72C25B from ECHO Microwave is a Band Pass Filter with Frequency 2.41 to 2.48 GHz, Insertion Loss 1.5 dB, Rejection 25 to 45 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4F2442P72C25B can be seen below.