• Battery Powered：This clock will automatically work in power saving mode when powered only by 3 AAA batteries（not included).And the LED will turn off automatically 15s after your last operation and can be awake by a slight tap, snap, or clap.
• AC Powered：If you want the LED to stay on, please plug in the power cable(included) and power it with a 5V/1A USB/AC adapter（not included).To keep the time and avoid setting all parameters again after unplug the power cable,please install batteries.
• 12/24Hr：12 and 24 hour time display supported. Press "DOWM" to switch 12H/24H mode.
• Adjustable Brightness：lf you find the LED too bright during the night even adjusted to low level by“UP”button,you can long press the LIGHT button to turn off the LED or unplug the power cable and make the clock work in power saving mode.
• Easy to Read：The Digital alarm clock for bedrooms has big LED numbers, and display brightness can be easily adjusted for personal preference.

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