The DEI9766-21.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 21.396 to 21.404 MHz, Bandwidth 8 kHz, Center Frequency 21.4 MHz, Insertion Loss 4 dB, Rejection 65 dB@±17.5 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI9766-21.40MHz can be seen below.