The EMA4D1253P82D5B from ECHO Microwave is a Band Pass Filter with Frequency 1.21 to 1.29 GHz, Insertion Loss 2 dB, Rejection 5 to 40 dB, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1253P82D5B can be seen below.