The Acctim Eclipse Alarm Clock in Black boasts hybrid power by using solar power during the daytime and battery for night time.Includes crescendo alarm with snooze, Smartlite all-night blacklight and Acctim Superbrite backlight, which provides all-year round brighter and clearer display for easier night time viewing and those who need a little bit of help seeing in low-light conditions. Dimensions: 5cm x 10.5cm x 8cm.1 year guarantee