In Door Knock Sounds app are six sound effects that you can switch by pressing the arrow right or left. You can choose the right sound effect what you think best fits. This application has option to play sound effects in shuffle order if you do not know which one sound to use at a given time. Features: • Quality sounds effects • Timer option • Shuffle option • Vibration option • Sound record option Door Knock Sounds has been design to be simple. It's completely free to use anytime you want!