The DEI4316-20.40MHz from Dynamic Engineers is a Band Pass Filter with Frequency 20.3994 to 20.4006 MHz, Bandwidth 1.2 kHz, Center Frequency 20.4 MHz, Insertion Loss 5 dB, Rejection 50 dB@±160 kHz of Center Frequency. Tags: Surface Mount, Through Hole, Crystal Filter. More details for DEI4316-20.40MHz can be seen below.