Each suncream has a specific SPF level.
That SPF level "1" mean "I can protect your skin from the sunlight for 15minutes"
So, This application can calculate the time which we can protected by suncream since you cover your skin by that.
When the time's up, You can recognize that time by alarm.
You can use this application by very simple control.
Just set up the SPF level printed your own suncream
and click the "ON" button. then, the timer will start!.
P.S. SPF level "1" are same with 15minutes. but that is just maximum limit.
So, I set the numbers like this -> "SPF level 1 = 7minute"