[Correct Use Method]: No. 1. Before use, turn the timer knob clockwise for a full circle, starting from 0-0 (0-10 -30-55-0), No. 2, then turn counterclockwise of a watch until the required time. When the countdown is over, it will make a sound. If the above method is not followed, the timer may not ring [Mechanical-Manual]The mechanical timer does not need batteries. Simply turn the timer knob manually. The operation is simple and convenient. It is suitable for cooking and supervising childrens homework [Fit for Many Occasions]Our visual analog timer can be used on many occasions, it helps teachers to allocate students school time effectively; it is also an excellent assistant for managing the office working time; [TIME MANAGEMENT]: 60-minute learning clock helps with organization and focus between tasks. Desktop timer is great for kids and adults to improve time management and productivity while performing activities With a built-in 70 dB alarm, this visual timer has an audible ringing range of up to 49 feet. The mechanical stopwatch alarm lasts for 5 seconds and can be heard in another room. [Easy Access] Not sure where to put this visual countdown timer Dont worry - this kitchen timer comes with strong magnets that allow you to place it on metal surfaces like the fridge or the oven. [Easy to use] Our timer requires no batteries to operate. Simply wind the magnetic timer clockwise up to 55 mins until the dial turns red, then turn it clockwise. anti-clockwise to the desired time.