Slimline radio-controlled atomic quartz-movement keeps accurate time to within one second of deviation every 30 million years and automatically changes for Daylight Savings, in the spring and fall. Features easy-to-read black Arabic numbers, black minute and hour hands and a red second hand. Hanging hardware included. Uses one AA battery, not included. All plastic clock frames will biodegrade within an average of 2 years in a landfill environment (reference ASTM D5511.) Plastic bodies contain 30% post-consumer recycled content.