Large, stereoscopic black Arabic numerals against the white dial create a very clear and easy-to-read view. 12 inches / 30.5 cm in diameter, a sturdy black plastic frame, and a glass lens make cleaning easy and keep dust away from the dial. Perfect for home, office, or classroom use. The nail slot ensures easy installation; it can be easily hung on any nail, screw, or small wall hook. The precise sweep quartz movement guarantees accurate timekeeping and eliminates annoying ticking noises, ensuring a peaceful sleeping or working environment. Operation: Manual. Case Material: Plastic - Color: Black and white dial - Numerals: Readable from a distance, minute and second hands - Diameter: 30 cm. Powered by 1 AA battery; please use a standard zinc-carbon battery. (not included)