[Correct method of use]: No. 1. Before use, turn the timer knob clockwise for a full circle, starting from 0 to 0 (0-10-30 -55-0), No. 2, then rotate counter-clockwise to 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 monitoring children's homework [Fit for Many Occasions] Our visual analog timer can be used on many occasions, it helps teachers to allocate students' school time efficiently; it is also a great assistant for office work time management; [TIME MANAGEMENT]: The 60-minute learning clock helps with organization and concentration between tasks. tasks. The desktop timer is ideal for kids and adults to improve time management and productivity while performing activities With a built-in 70dB alarm, this visual timer has an audible ringing range ranging 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? Don't worry - this kitchen timer comes with strong magnets that allow you to place it on metal surfaces like the fridge or oven. [Easy to use] Our timer requires no batteries to work. Simply wind the magnetic timer clockwise up to 55 mins until the dial turns red, then turn it counter-clockwise to the desired time . Note: Please allow 1-3 mm error/1-3g weight error and actual product color may vary due to lighting conditions.