Math and time have something in common. Can you guess what? If you guessed "numbers," give yourself a pat on the back. If you guessed "emu," go get some help. But seriously folks, did you know that math can help you get up in the morning? It sure will - especially if you have a Twist Equation Alarm Clock! The concept behind the Twist Equation Alarm Clock is very simple. When you alarm goes off, the screen that normally displays the hours will show a plus or minus sign, and the screen that normally shows the minutes will display a number. The only way to turn off the alarm is to rotate the two numerical wheels on either side of the operator (plus or minus sign) to make the equation make sense. And once your brain solves the equation puzzle, there's no returning to sleep for you. Use math to wake up, with your Twist Equation Alarm Clock! Twist Equation Alarm Clock The only way to silence the alarm is to rotate the numerical dials and solve the equation. Rotate function wheel to display time, alarm, or date. 12 or 24 hour format. Batteries: 3 AAA (not included). Dimensions: 5" x 2.25" x 2.25"