This clock incorporates Night Vision Technology. This cordless battery operated clock allows you to view the time in a dark room. Making it hands-free, the clock automatically senses an extremely low light environment, and illuminates a soft green glowing backlight so to identify the current time in a darkened room. Its integrated sensor will automatically shut off the backlight when the light in room brightens to save power. You can also activate its bright backlight anytime by pressing the SNOOZE/LIGHT button. Easy access time set buttons are located on the top of clock with a simple on/off switch to activate/deactivate the alarm, and easy-to-read 2.50 inch display. Its modern metallic blue case offers a contemporary look and with battery operation, makes it portable. With the night vision alarm clock, you get a straightforward, simple approach to waking up on time. The five-minute snooze button is handy for those mornings when you're just not ready to wake-up. Requires three AA batteries (not included) to power clock.