Product Description: This is a unique and creative Mathematical Formula Wall Clock made from acrylic. As the clock ticks, the hands move around the dial indicating the time of day through a different math problem for each hour. It is perfect for anyone who works with numbers and enjoys a challenging brain exercise Only one AA battery (not included) is required for this clock, energy-saving. Such a special wall clock can be a good gift for teachers, friends; or can be perfect decor for home, classroom, office, etc. Main Features: - The matte black powder coated with white letters and numbers, compose different math problem for each hour, making it unique and creative to keep track of time - Low noise design, silent sweep gives you a quiet environment - Large screen with large numbers, easy to read the time - Superior moment keeps accurate time - Comes with hook design, easy to install - Made from acrylic, lightweight and durable - Works with just 1 AA battery (not included), low power consumption Specification: - Main material: acrylic - Powered by: 1 x AA battery (not included) - Dimension: 295 x 295 x 25mm Note: the clock is unframed, and there is no glass cover on the clock. Package weight: 0.382 kg Package Size(L x W x H): 32.00 x 31.50 x 4.00 cm / 12.6 x 12.4 x 1.57 inches Package Contents: 1 x Wall Clock