Specification: Product size: 60*60*35 (mm) Product weight: about 70g Describe: Rotary timing, easy to use Mechanical heart, no battery required Arrange time reasonably and refuse procrastination Timing range:60 minutes Ring time: 3 seconds How to use: Turn the timer clockwise once to the zero scale, and then turn it counterclockwise back to the required time, and the timer will make a crisp bell at that time. Do this every time you use it, please follow this method. Note: The size is measured by hand, there may be a little error, and the data is for reference only. Due to different lighting and each monitor, there will be different degrees of color difference, please refer to the actual product.