This app supports the German tradition of the "Bescherung" (thus the name). Families gather with their kids in a sepate room, sing Christmas songs, and wait for the Christkind / Weihnachtsmann (Santa) to arrive and bring the presents. When Santa has come, he'll ring a bell so signal the Bescherung has happened. The kids storm down and find the Christmas tree + presents there.
This app helps here by magically ringing one of a number of bells you can select at a certain time.
I have no idea whether in the US or England there are similar traditions. My expectation is "no". If you live in the English-speaking world and would like to use this app, I'll be happy to do a translation to English. Just drop me a mail.