The EDA4E3950P500C25 from ECHO Microwave is a Band Pass Filter with Frequency 3.7 to 4.2 GHz, Insertion Loss 1.5 dB, Rejection 15 to 40 dB, Return Loss 13 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EDA4E3950P500C25 can be seen below.