Before EVERYTIME use, wind the timer knob clockwise a full round, starts from 0 and ends to 0 until the timer pointer aligned with zero symbol. Wind the timer knob back counterclockwise to the minutes (number) you wanted it to ring. If fail to complete these 2-step procedures, the timer WON’T ring.The mechanical timer will make 80 decibel sound alarming and will last 3seconds+30miliseconds (Test distance 0.98 foot) when time’s up, the ringing sounds is audible within the distance at least 29.5ft (9m). Different floors DO NOT recommend to use. Tested under OPEN, straight-line distance circumstance, NOT noisy place. DIFFERENT use/test circumstances the result May VARY, ACTUAL using circumstance In Prevail.Turning knob, retro mechanical tick tick sound. With this simple kitchen timer you can master your cooking time on a special delicious food.Ideal as a kitchen timer, sports timer, egg timer, egg timer, homework timer, timer for debates or as a game timer.