The EDA4H3900P400F28 from ECHO Microwave is a Band Pass Filter with Frequency 3.7 to 4.1 GHz, Insertion Loss 3 dB, Rejection 28 to 50 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EDA4H3900P400F28 can be seen below.