The EMA4D978P5E40B from ECHO Microwave is a Band Pass Filter with Frequency 975 to 980 MHz, Insertion Loss 2.5 dB, Rejection 40 dB @ Fc to 50 to Fc to 100MHz, Return Loss 15 dB. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for EMA4D978P5E40B can be seen below.