The EMA4D2450P100D40B from ECHO Microwave is a Band Pass Filter with Frequency 2.4 to 2.5 GHz, Insertion Loss 2 dB, Rejection 40 dB @ 2100MHz, Return Loss 14 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2450P100D40B can be seen below.