This item Measures: 3.75" x 4.25" x 2" / 9.5cm x 11cm x 5cm. It has highly accurate timing! One-minute to one-hour time settings. Easy to read and operate. Operating Instructions: Turn the timer dial all the way around to the 60-minute mark, then backward to the time you want to set it for. Failure to follow these instructions will result in the timer not working properly. The ringer rings for approximately 4 seconds.