For any parents with a smartphone looking to help convince any doubting children that Santa Claus is real, there’s now an app for that.

Spanish advertising agency Shackleton has released a clever new app that takes control of the phone’s speakers and flash, playing a pre-recorded message of the man in red leaving presents from behind the door. It's a clever way of using modern technology to keep an old Christmas tradition.

Check out how the SantApp works in this video:

You can download SantApp here.