The Chicago Lighthouse Black Atomic 12.75" Clock is perfect for schools and learning environments. This clock is radio controlled for high accuracy, and automatically changes hour hand in Spring and Fall. Non-yellowing 12" white dial face features bold, easy-to-read Arabic numerals, black hour and minute hands, and red second hand. Made with high quality components, each clock is subject to our two-step testing procedure before it is packaged. Plastic clock bodies are durable and biodegradable, made with 30% post-consumer recycled content. Lenses are shatter resistant and UV protected. One AA alkaline battery required (not included). Hanging hardware included for ease of use.