Features: Waterproof high-density, eco friendly; Silent sweeping movement, mute movement, silent clock give you a quiet night; Can be used for gifts, crafts, business gifts, holiday gifts, promotion gifts, home decoration; Suitable for smooth walls of living room, kids bedroom, dining room, kitchen, office, bathroom, coffee shop, hall, etc. A WAY TO TRACK THE HOURS Instead of Roman numerals or traditional numbers, this wall clock has a different equation at each demarcation PERFECTLY SIZED Clock measures 11-1/2 inches in diameter and is easy to spot from afar GO WITH EVERYTHING DESIGN Black and white color scheme makes the clock a chalkboard and complement any color palette GREAT GIFT IDEA Give one of these wall clocks to a math teacher, , mathematician or anyone who just loves numbers NO CORDS OR WIRES Clock runs on one AA battery (not included), Only insert hi quality alkaline batteries using cheap batteries may cause a safety hazard Name: Wall Clock Color: Black Material: wood Size: 30*30*5cm Weight: 380g Package Contents: 1pcs Living room wall clock Note:Products on the of a protective film, before tearing. Take 1 AA carbon battery( not included ). Powered by Ordinary Carbon Zinc battery, not Alkaline battery. Precautions: 1.Be careful to beat, do not hit the hook position, so as not to break the hook. 2.If used in the tile wall, please do not enter the tile joints, so as not to damage the tile . 3.Please avoid to use the bad wall or dead wood. 4.The hook is carrying 3KG, if any other use, please do not over weight. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.