Housing Material: Plastic Material lustra: ordinary lustro glass Disc Material: PVC Diameter: 30 cm/11,81 inch Glowing: numbers and hands with luminescence function. It requires enough light energy do absorb during the day. At night, it fluoresces so you can see the light at night or in the dark. (Hint: the wall clock will glow in the dark for about 5-6 hours, the length of the lighting time depends on the light absorbed during the day.) EASY TO READ: The large digital display contrasts with the black dial, making it easy to read the time from any angle. Ideal do dining rooms, living rooms, family rooms, bedrooms, living rooms, kitchens, offices and conference rooms. QUIET MOVEMENT: The highest quality precision quartz movement ensures time accuracy, while the quiet movement provides an excellent do learning and working environment. EASY INSTALLATION: Easy to install, simply drive small nails into the plastic hooks and securely hang it on the wall in seconds. BATTERY POWERED: Powered by one AA battery (battery not included do set). Use ordinary carbon batteries, do not use alkaline batteries or rechargeable batteries, otherwise it will shorten the life of the mechanism and affect the accuracy of time.