SIZE12 inch round analog math wall clock with different mathematical equations marker instead of traditional numbers. This unique clock measures 12" diameter and is the perfect size for the kitchen, living room, office, or bedroom BATTERY OPERATE:Powered by one AA battery - not included (Note: Plus side of your battery should be inserted first) BEST GIFT:A perfect choice for housewarming gifts, christmas/Xmas gift,children's day gift,bridal gift, anniversary gift, mothers day gift,fathers day gift, birthday present, holiday gift etc.Share this beautiful wall clock with the ones you love. SILENT WALL CLOCK:Quiet wall clock, no"TICK TOCK",no loud ticking,no noise,this silent wall clock won't bother you when you reading,working,thinking, conversing or sleeping. EASY to READ:A unique and fun way to track time! Large chalkboard-like equations/numbers against background are easy to read. second hand provides extra clarity<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin