Time Projection Feature Easily view the time projected onto with the adjustable 180 projector. >>> Clear LED Display Large digital screen shows the time, temperature, and alarm status with adjustable brightness.Multi-Function Clock Includes alarm with snooze, indoor temperature display (C/F), and 12/24 hour switchable formats. >>> User-Friendly Operation Simple controls for setting the time, alarm, and projectionperfect for any age. >>> Modern Home Decor Sleek design fits seamlessly into bedrooms, offices, dorm rooms, or modern living spaces. >>> This product does not come with a battery, so the customer has to insert the watch battery themselves. >>> Power Supply : Battery: 3 * AAA batteries (batteries not included).it is a king of low power consumption alarm clock, environmentally friendly.