The DEI9725-1.40MHz 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 25 to 60 dB @- 500 KHz, -3400 KHz. Tags: Crystal Filter, Suspended Substrate Filter. More details for DEI9725-1.40MHz can be seen below.