Or even like a last five second beep... beep... beep... beep.... buzzz!
Sound

you should hear the rattlesnake (https://images.chesscomfiles.com/chess-themes/sounds/_MP3_/default/tenseconds.mp3) 10s before your time runs out. and also on your first move after 10s and 20s (game will abort at 30s)
you should hear the rattlesnake (https://images.chesscomfiles.com/chess-themes/sounds/_MP3_/default/tenseconds.mp3) 10s before your time runs out. and also on your first move after 10s and 20s (game will abort at 30s)
that sound is gone now
Where is the sound about ending time?
May be it will be great to make sound when 15sec time is expired...