The EMA4D1260P20E50B from ECHO Microwave is a Band Pass Filter with Frequency 1.25 to 1.27 GHz, Insertion Loss 2.5 dB, Rejection 50 dB @ 1140 MHz, Return Loss 20 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D1260P20E50B can be seen below.