The clip runs for about 15.6 seconds, giving the spaced knocks room to build tension without immediate trimming. Download the MP3 to keep it available offline, then import it into an editor, soundboard, or compatible phone settings. You can trim a shorter section for a notification tone or retain the full sequence as a ringtone. Keep background music low so the taps remain distinct, especially on phone speakers. For a sharper scare, place a scream meme after the final pause rather than over the knocking.