ZHPUAT Morning Clock,Low Light Sensor Technology,Light on Backligt When Detect Low Light,Soft Light That Won't Disturb The Sleep,progressively Louder Wakey Alarm Wake You up Softly.Color White A big, friendly display, clean and simple design, and customizable backlight brightness are the hallmark features of this elegant little alarm clock that gives you everything you need in a clock without a lot of confusing extras Smart and manual backlight: The smart backlight can keep on automatically when surrounding becomes dark if you toggle the "Brightness" switch to "Low/High" position. And the backlight can be also turned on by clicking the top button whether dark or daylight, however which can just last for 5 seconds. Additional on-screen information includes month, date, alarm setting, and indoor temperature. You can set the time display to a 12- or 24-hour clock, and the snooze button is always handy and easy to find it starts off with short beeps then gets to longer more frequent beeps, the volume gets progressively louder from 50 to 75 decibels until you turn it off. No need to choose between a harsh alarm that blasts you out of bed, or a too-soft alarm that lulls you back to sleep Noted: Powered by 3*AAA Carbon Battery Only,No USB Cord.Full-satisfaction guarantee! If you are unhappy with this clock for any reason, contact us within 90 days for a full refund or replacement. There's also a 365 day quality guarantee against defective parts The alarm volume will not change,but the beeps frequencey will become faster and faster which will last 1 Minute. Please note the view angle, purchase with caution if this can&#039;t meet with your need. :) 12-hour or 24-hour, Celsius orFahrenheit. As your wish, click the round buttons &#034;12/24&#034; or &#034;C/F&#034;. Toggle the &#034;SENSOR&#034; to &#034;ON&#034; position,the alarm clock backlight will light-up automatically when the surrounding beomes dark. No DC charger. Only batteries operated (Not included). Details show Compeletelysilent,zeroradiation. Good for sweet sleep and healthy body. A very good choice as a Festival gift for kids and family.