Brightness Updated on Sep 28 2018: 0-100% adjustable brightness (before: 2 level)80% more negative reviews for the alarm clock are too bright to sleep at night. So we made our updation with metrics and user feedback.7.5" LED Jumbo Dimmable DisplayThe clock boasts a large, white 7.5-inch LED letters for increased visibility. The time and alarm indicator are clearly displayed, easy to read.Snooze FunctionBeeps begin with a subtle, low volume that gradually increases to a higher volume to gently wake you up. Slight press the touch pad to activate snooze and get a few extra minutes of sleep. Snooze will repeat every 10 minutes until you turn off the snooze mode by pressing any other buttons.Adjustable VolumeThe alarm sound can be set at Low or High volume with easy slider according to your personal preference.USB Charging FeatureThere are two USB charging ports on the back panel, one for clock power supply, another for charging phone or tablet.Battery Back-upBattery backup (2 AAA batteries not included)enables to memorize time, alarm during electric power failures, to make the clock work please plug the included charger.Simple OperationDesigned with absolute simplicity in mind, you will have no problem to set/use it, easy for kids, seniors and the elderly.SpecificationsTime Display: 12-hour time formatAlarm: last for 1 minuteSnooze: every 10 minutesPowered by: mains powered by USB adapter; 2 AAA backup battery (not included) for maintaining time.Product Dimensions: 7*1.5*3 INPackage Included1* LED alarm clock1* USB cable1* USB adaptor1* User manual