The device is also equipped with practical additional features, namely a backup battery system. This is vital as it can retain all settings even after a power outage and can be used for approximately two years. This product requires an adapter; it does NOT include a battery. This digital clock can project the time onto the wall or ceiling, so sleepers don't have to turn over to check it. The arm can rotate 180 degrees for optimal positioning. Furthermore, you can adjust the brightness of its main display whenever needed. This digital clock comes with a 3-level brightness dimmer to ensure you find the perfect setting for your sleep. This particular projection alarm clock for bedrooms features a gradual volume increase, ideal for heavy sleepers who won't get used to a loud, sudden sound. And by pressing the large SNOOZE button at the top, you can get an extra 9 precious minutes of sleep until the next alarm. Sleek and stylish design, beautifully packaged. A great way to show your thoughtfulness and a unique way to surprise someone. This digital alarm clock is a perfect gift for anyone, young or old, woman, boy, or girl. Also suitable for all holidays such as birthdays, Christmas, Valentine's Day, Father's Day, Mother's Day, etc.