VORCOOL wall clock is made of premium wood with white letters and numbers, the clock is great for home, classroom, office, etc. As the clock , the hands move around indicating through a different math problem for each hour. A unique and creative way to keep track of time. This wall clock is a fun and challenging brain exercise. Solve might solve of time. The perfect teachers, students, engineers and accountants or anyone who works with numbers. Feature - Brand: VORCOOL. - Color: Black. - Material: Wood. - Size: About 29.7 x 29.7 x 1cm/11.7 x 11.7 x 0.4inch. - Made of premium wood with white letters and numbers, the clock is great for home, classroom, office, etc. - As the clock , the hands move around indicating through a different math problem for each hour. - A unique and creative way to keep track of time. This wall clock is a fun and challenging brain exercise. Solve might solve of time. - Powered by 1 AA battery(not included), it is easy and convenient to use. - The perfect teachers, students, engineers and accountants or anyone who works with numbers. Package list: 1 x VORCOOL Creative Mathematics Blackboard Clock Wall Clock Teacher Classroom Home Office (Black)