Unique Design --- Math wall clock is a unique way of timing, it is an interesting and challenging brain exercise. Instead of Roman numerals or traditional numbers, this clock has a different equation at each division. Novelty And Fashion --- Mathematical equation clock. With the ticking of the clock, the hands move around the dial, indicating the time of day through different mathematical questions every hour. The clock will bring a unique modern style to any room. Versatile Style --- unique wall clock, black and white color scheme makes the clock look like a blackboard, and can complement any color palettes. The Perfect Gift --- a unique gift idea, a fun gift for math teachers to han-g in the classroom. For math teachers, engineers, mathematicians or anyone who only loves numbers. Exquisite Clock --- Exquisite size clock, 11.8 inches in diameter, easy to find from a distance, material: acrylic; black, no wire, use an AA battery (not included) to supply power