Skilcraft Slimline radio-controlled atomic quartz movement keeps accurate time to within one second of deviation per 30 million years and automatically changes for Daylight Saving Time. Use only in the continental US in daylight savings states. Clock hour hand makes two revolutions every 24 hours. Features easy to read black Arabic numbers, black minute and hour hands, and red sweep second hand. Frames will biodegrade within an average of 2 years in a landfill and contain 30% post-consumer recycled content. Clear lens is shatter resistant and UV protected. Hanging hardware included. Requires one AA alkaline battery (not included).