[Upgrade Version] ZHPUAT 4.6" Smart Backlight Alarm Clock with Dimmer (Green) A big, friendly display, clean and simple design, and customizable backlight brightness are the hallmark features of this elegant little alarm clock, which gives you everything you need in a clock without a lot of confusing extras. Smart and controllable backlight: You can make the backlight of this clock automatically adjust itself to get dimmer as the room gets darker, and you can manually set the brightness to a constant Off, Low, or High. 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. Gentle wakeup alarm starts out soft and gets progressively louder 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 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 366 days quality guarantee against defective parts.