The Wake-Up Alarm Clock has Sunrise Wake up Light and Sunset light for going to sleep. It also features mood lighting with light effects such as multiple colors at once. There is a timer for the mood light effects so you can rest easily knowing the lights will dim as you fall asleep. There are 5 tranquil sounds that can be heard through a clear speaker. The dimmers give you access to the clock display and the light diffuser. The clock cabinet is a beautiful natural wood finish. The battery backup is used for storing the time and alarm settings if the power is suddenly interrupted. During battery backup the clock s display will not be lit. Once the power is restored the display will re-light. Check the time to make sure it is accurate and adjust if necessary. Product Dimensions: 7.09 x 4.06 x 3.15