The EMA4D2507P15E40B from ECHO Microwave is a Band Pass Filter with Frequency 2.5 to 2.52 GHz, Insertion Loss 2.5 dB, Rejection 40.0 dB @ 2407.5MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D2507P15E40B can be seen below.