12-inch / 30.5cm diameter, sturdy plastic black frame and glass lens make it easy to clean and keeps dust away from dial. Perfect for home, work office or classroom. Large Black stereoscopic Arabic numbers against the White dial face creates a very clear view and easy to read. Precise sweeping quartz movement guarantees accurate time display and eliminates disturbing ticking sound, ensuring a good sleeping or working environment Powered by 1 AA battery, ordinary Carbon Zinc battery, not Alkaline battery makes sure work better( not included) Dimensions: 30.5 x 30.5 x 4.3 cm. Silent Accurate time display Simple, elegant design Nail slot ensures easy installation, can be hung on any nail, screw or or small wall hook easily