Description: Material:MDF Size: 11.8inch Color:black Quantity:1 x math clock Features: PERFECT SIZE: 11.8" wall clock.Printed on fiberboard face,not real wood (MDF) ,no frame,no cover.The perfect wall clock for an office,classroom,bedroom,bathroom and any room in your home. GO WITH EVERYTHING DESIGN: Black and white color scheme makes the clock look like a chalkboard and will complement any color. A UNIQUE WAY TO TRACK THE HOURS: Instead of Roman numerals or traditional numbers,this wall clock has a different equation at each demarcation. GREAT GIFT IDEA: Give one of these wall clocks to a math teacher,engineer,mathematician or anyone who just loves numbers. NON-TICKING: Precise quartz movements guarantee accurate time.Enjoy a quiet environment! Note: ​Alkaline batteries are not suggested.Uses 1 AA carborn battery - not included(alkaline batteries may leads to the clock's inaccuracy). The size of the manual measurement may have some error,it is within the range of ±1 cm,the actual size shall be subject to the actual object. Due to different lighting and shooting conditions,the color of the image may differ from the actual product. Please refer to the actual product. 12 inch round analog math wall clock with different mathematical equations at each hour marker instead of traditional numbers. A unique and fun way to track time! Large chalkboard-like equations/numbers against black background are easy to read. Perfect gift for math lovers,college professors,mathematics teachers,students,engineers and scientists. Great for a classroom,office,study,college dorm room,library,bedroom,bathroom or any room in your home or business Silent non-ticking mechanism with sweeping movement. Enjoy a quiet environment! Precise quartz movements guarantee accurate time Sturdy plastic frame and glass lens make it easy to clean and keeps dust away from dial. Great Christmas/end of year gift or conversation piece! Easy To Hang. Powered by one AA battery - not included (Note: Plus side of your battery should be inserted first) 1-year Manufacture Warranty Included