Please look here before buying The timer is a mechanical timer, so it needs to be rotated clockwise to 55 minutes before use Then turn it counterclockwise to the time scale that needs to be set. MECHANICAL OPERATION: no power supply, manual winding, clear sound. High-decibel ringtone warning, accurate cooking time. The bell will automatically ring when cooking timer magnet rotates to setting time for a mechanical drive. GOOD DESIGN:High-decibel ringtone warning, accurate cooking time. Clear scale helps you set the time clearly in minutes. Manual dial to set timings of up to 60 minutes. MULTIPLE USAGE: Kitchen clock timer not only applied in the kitchen cooking time, also can be applied to children do the homework time, time to dye the hair, apply face film timing, yoga time, take a nap time, the meeting time, experiment time, children playing games timing, timing, etc. HIGH QUALITY AND CUTE APPEARANCE : This stainless steel kitchen timer is made of high quality stainless steel, which is durable and hard to rust. Thick stainless steel to create a shell, matte feel good, easy to clean.