Screen Time is a simple app that allows you to set limits on the amount of time you children use an iPhone or iPad. Set a time length, press start and pass it to you children. After the time expires, a series of notifications will prevent your children from using the device until you enter the correct passcode.
A single notification will be posted to Notification Center to all devices that share an iCloud account (e.g. iPhone, iPad, Mac Book Pro, Mac Pro). Continous notifications will be presented on the device along with a audible alert. The camera's flash will fire when on the passcode entry screen. These work in concert to disrupt the child's activity on the device and to alert the parents that their screen time is up.
You can monitor how much time is remaining in the current session by switching to multi-tasking mode in iOS 7. Simply double-click the 'Home' button on the device to display recently used apps. Screen Time will show you the minutes remaining on the application screenshot. The background color changes to provide a visual cue to younger users who can not yet read or tell time.
To assist with understaning and managing your children's screen time, the application allows you to set up users so you can track different users on the save device. Screen Time uses iCloud to sync user and session data. This allows you to monitor your child's screen time between devices.