General description This modern wall clock features a unique design with mathematical formulas instead of traditional numerals, making it a perfect decorative piece for various settings such as living rooms, children's bedrooms, dining rooms, kitchens, offices, conference rooms, and cafes. With a diameter of 11-1/2 inches (30 cm), it is easily visible from a distance. The black and white color scheme gives it a chalkboard appearance, complementing any color scheme. It operates silently, ensuring a quiet environment. Technical specifications Material: Wood Color: Black Size: 30 * 30 * 5 cm Weight: 380 g Power: 1 AA battery (not included) Battery type: Ordinary zinc-zinc battery recommended Installation Be careful not to knock the hook to avoid breaking it. If installing on a tile wall, avoid entering the tile joints to prevent damage. Avoid using on unsuitable walls or dead wood. The hook can bear up to 3 kg; do not exceed this limit. Usage Ideal for gifts, crafts, business gifts,