The DEI9724-1.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 0.05 to 2.75 MHz, Bandwidth -350 KHz, -2700 KHz, Center Frequency 1.4 MHz, Insertion Loss 6 dB, Rejection 60 dB @ 500 KHz, 3400 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9724-1.40MHz can be seen below.