?Have to Plug-in?It's NOT battery operated. It must work with 5V/2A power adapter (included). There's a memory battery inside so it will remember your setting even it's disconnected. ?Great Gift Idea With Lifetime Warranty? This digital alarm clock is not only suitable for your room, but also a great gift for Christmas, New Year or Birthday. It has no limitation, you can give it to kids or seniors, boys or girls, friends or families. Also provides Lifetime product warranty. ?Optional 12/24 Hour Time Format and DST? This digital alarm clock has optional 12/24 Hour time format and Daylight Saving Time that meet everyone's need. ?Dual Alarm Clock? This digital alarm clock can be set 2 different alarms, convenient for family members with a different schedule. Snooze function for extra 9 mins sleep. ?RGB Color Changing Numbers? The clock has 8 display modes – white, red, green, blue, gradient, magic color, left and right gradient, up and down gradient. ?Large Display With Adjustable Dimmer? 7-inch LED large clear display for digits ensure the time is easy to see even for impaired vision people. The smart brightness dimmer design allows you set the brightness of display with 5 level. You can also choose the font color displayed. Alarm volume can be adjusted to 5 levels according to your depth of sleep, Louder for heavy sleepers while slight for light sleepers. Built-in two USB charging port allows you to charge your smartphone and other devices.