ABS, mechanical movement, reminder, no battery required Setting instructions: Take the timing of five minutes as an example At the beginning, the for points to 0, and in the first step, turn it clockwise to 55 minutes Turn it counterclockwise for another five minutes, and when the timer reaches 0, the timer will automatically Cute and interesting Shape design, and wear-resistant, does not hurt the desktop For mechanical timers, the chain must be wound before use Please read the instructions before use to avoid damage Suitable for cooking, baking, learning timing, cultivating the concept of for time, planning for time rationally, and improving learning efficiency