Staring at the phone screen can put a lot of strain on your eyes and cause eye fatigue.
Give your eyes a break by applying the 20-20-20 rule.
Every 20 minutes, take a 20-second break and focus your eyes on something at least 20 feet (7m) away.

Features:
• Notifies you after 20 minutes to give your eyes a break
• Starts countdown automatically when the screen is turned on
• Configure the notification behavior the way you like
• start and stop the service manually
• confirm brake in notification
• take care of your eyes

-minor bugfix