Extra large 4' numerals, 4 digit (00:00), vibrant LED display for optimum visibility 250 Foot visibility making it easy to see across a large room Perfect for the visually impaired, use in any home or work environment where high visibility is needed Non-glare shatterproof polycarbonate lens for easy viewing and durability, Low profile, ABS frame. Flexible mounting options, including dual clock wall and ceiling brackets for enhanced viewing in long hallways and large open spaces. 110 Volt (6 ft. cord) with Internal 30 day battery back up. No need to reset the time after a power outage. Industrial Use quality. 1 Year Manufacturers' Warranty Made in the USA