This is a cube-shaped digital timer, approximately 72mm on each side. The LCD display resembles an hourglass, allowing you to easily see the remaining time. It alerts you when the timer ends with an audio alarm. The alarm time can be set to your preference, but there are dedicated buttons for 25 minutes and 5 minutes, designed with the Pomodoro Technique in mind. It runs on three AA batteries (not included). The last photo shows a scanned image of the instruction manual (the physical manual is not included). If you would like a printed copy of the manual, please send me a message after purchase, and I will include it with your order. Thank you for looking.