About This 【Alarm Digital Clock for Kids Bedrooms】 Auto DST, Alarm, Calender, 12/24 Hour, Backlight, Volume, Colors, USB without Plug. 【4 Kinds of Adjustable Backlight】 With attached USB cable (not including the plug) for full functional screen, the backlight is adjustable: from HIGH to OFF. The battery (not included) is mainly used to back up data, such as date, time, and alarm. 【3 Kinds of Adjustable Volumes】 It has different volume setting to set the alarm lower or higher: 55-70-90DB, Loud-Super Loud-Crazy Loud. 【Alarm Clocks for Bedrooms with USB】 Alarm Clock with Snooze, USB Typ-C attached (excluding the plug). Perfect for any room, large numbers that are easy to read. Compact Size: 5.5 in*0.9 in*2.2 in. 【USB Powered & Battery Backup】Use the included USB cable to enjoy a constantly illuminated screen with full functionality. When using battery power (not included) as a backup, the screen will turn off after 10s to conserve energy; a simple touch reactivates it. Overview Brand : HODIK Color : White Display Type : Digital Style : Modern Special Feature : Daylight Saving Product Dimensions : 1.37"W x 4.32"H Power Source : USB without plug Shape : Rectangular Are Batteries Included : No Item Weight : 0.15 Kilograms