: Mechanical timer, customized with special machines, the principle is the same as mechanical watches;1 minute - 60 minutes can be adjusted arbitrarily;Exquisite shape, decorations for the very cute houses;Wide range of applications: medicine, kitchen, household, school, industry and mining, nursing, etc.Instructions:Turn the timer clockwise once to the zero scale, then turn it counterclockwise to the required time, and the timer will beep crisp sound at this time.Precautions:When rotating to the end, do not use too much force, so as not to damage the built-in movement;When the timer is working, please do not turn back and forth repeatedly to avoid damaging the built-in movement;The shell of the timer is made of ABS plastic, please do not throw, drop, break the timer shell easily damaged.The timer case and the built-in movement are made of plastic, please do not roast or burn with fire. .