Surborder Shop Digital Alarm Clock Battery Operated with Large Display, Snooze - Travel Alarm Clock and Home Alarm Clock - (Black) Real Bigger LCD Screen,Energy Saving,Bold Typeface,Clear and Comfortable Visual Sense Technalogy, Make Sure You Can See Exactly the Time Without Troubling Sleep Blue LED Backlight, it help you to see time in the middle of night,and Dont Worry,This Also Wont Disturb your sleepness, You can use the button above and sound and to turn on the backlight, easy to use. Adjustable Time and Date Format,Circumstance Temperature Monitoring Function,Make Yourself a Easy Life Power Source: AAA Battery(Not included),can be placed in the bedroom, office and home,meet your requirement Voice backlight function: press the light button can turn on or turn off backlight, by 1 meter clap the lights are turned, or tap the table open backlight, light continue to 5 seconds off.