Yindhgdr Digital Plug-In Alarm Clock Dimmable for Bedroom 1 Pcs White

[3 Brightness Levels] the largest button in the middle to adjust the brightness to 3 levels (high/medium/low). [USB Powered & Backup Battery] The alarm clock is powered by a wall outlet (adapter not included) and can be powered by 3 AAA batteries (not included) as backup. In the event of a power failure, the alarm clock works on battery and automatically saves time, date and other settings. Note: Batteries discharge quickly and it is recommended to power the device only from a wall outlet. [Two modes of power supply-USB/Battery] Connect the digital alarm clock to the power outlet (adapter not included), the alarm clock screen remains on; if the digital alarm clock is powered by the battery (not included), the screen automatically sleep when there is operation, and the screen can be illuminated by pressing any button. Note: batteries consume power quickly, it is recommended to use a USB power adapter. [Snooze] When the digital alarm clock emits one, touch the large top snooze logo to get an extra 5 minutes nap, it can last 3 repetitions; And you can long the large top snooze logo for 3 seconds to turn off the snooze mode; the large top snooze logo for 3 seconds to stop the alarm today and ring again day. [Tip]If the device is powered via USB (adapter not included), the alarm clock screen remains on. When it is battery operated (battery not included), the alarm clock enter saving mode after 13 seconds and turns off the screen, which you can activate by pressing a button or by voice.