1. [VERY IMPORTANT 2 STEPS]: 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 itto ring. If fail to complete these 2-step procedures, the timer WONT ring.2. [80dB SOUND ALARM]: The mechanical timer will make 80 decibel sound alarming and will last 3seconds+30miliseconds (Test distance 0.98 foot) when times up, the ringing sounds is audible within the distance at least 29.5ft (9m). Different floors DO NOTrecommend to use. Tested under OPEN, straight-line distance circumstance, NOT noisy place. DIFFERENT use/test circumstances the result May VARY, ACTUAL using circumstance3. [SIMPLE DESIGN]: Turning knob, retro mechanical tick tick sound. With this simple kitchen timer you can master your cooking time on a special delicious food.quantity of delivery:1 piece(Package contents: Only the above package contents, excluding other products.)size:6*6*3.5cm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)color:black colors(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)