[Correct Use Method]No.1. Before use, rotate the timer knob clockwise for a full circle, starting from 0 to 0 (0-10-30-55-0), No.2, and then rotate counterclockwise to the required time. When the countdown is over, it will make a sound. If the abovemethod is not followed, the timer may not sound [Mechanical-Manual]the mechanical timer doesn't need any batteries. Just rotate the timer knob manually. The operation is simple and practical. It is suitable for cooking and supervising children's homework [Fit for Many Occasions] Our visual analog Timer could be used on many occasions,it helps teachers to allocate students school time effectively;its also a great assistant for the management of work time at office; [TIME MANAGEMENT ]: The 60-minute learning clock assists with organization and concentration among tasks. The desk timer is ideal for kids and adults to improve time management and productivity while completing activities ith a built-in 70db alarm, this visual timer has an audible ringing range of up to 49 feet. The mechanical stopwatch alarm lasts 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 doesn't require any batteries to operate. Just wind the magnetic timer clockwise to 55 min until the dial turns red, then rotate it counterclockwise to your desired time.