[Correct usage method]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, and then turn counter-clockwise to the desired time. When the countdown is over, a sound will be heard. If the above method is not followed, the timer may not sound [Mechanical-Manual]: the mechanical timer does not need batteries. Just turn the timer knob manually. The operation is simple and practical. It is suitable for cooking and monitoring children's homework [Suitable for many occasions]: Our visual analog timer can be used for many occasions, it helps teachers to allocate students' school time effectively; it is also a good assistant for managing working hours in the office; [TIME MANAGEMENT]: The 60-minute learning clock helps with organization and concentration among tasks. The desktop timer is ideal for children and adults to improve time management and productivity while completing activities with a built-in 70db 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 place 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 clock timer does not require batteries to operate. Simply turn the magnetic timer clockwise to 55 minutes until the dial turns red, then turn it counter-clockwise to the desired time.