This is a rare item! The numbers 1-12 on the clock face are expressed as mathematical formulas. If you get it right away, you're definitely a math and science enthusiast! It can be used in homes and offices, as well as for interior decoration in various schools, cram schools, laboratories, and children's rooms. This clock has a unique design that is hard to come by. Please take this opportunity to get one! Power source: 1 AA battery Quartz type Please refer to the photos for the size. #Science #Math #Formula #Numbers #math #Physics #Chemistry #Science #Clock #Interior #Furniture #furniture #Office #WallClock #Clock #Analog #Quartz #Joke #Joke #Wit #Ingenuity #CramSchool #Classroom #Class #ReferenceBook #Akahon (Red Book - a type of exam prep book) #Textbook #EntranceExam #Research #Lab #Dr #Black #Class #∞