Features: There is strong magnet on the back of the cooking timer, it is easy to place on any flat metal surfaces such as refrigerator and microwave oven and so on and make sure it will not fall off when it makes alarm, the rings will be very loud. none Battery Required & Easy to Use The mechanical kitchen timer doesn’t require any batteries, it is energy saving and friendly. Just wind it up and set time, it will work.small and compact, you can carry it with you anywheres. Mechanical Timer Working Principle The 60 minutes wind up timer doesn’t need battery, it is powered by a mechanical movement with spring, just like an old spring toy, you need to wind up first to make it work. So when you hold this timer, you must turn to 55 every time to activate the spring and then turn back to the time you want to set. Why Not rings? If the timer you received doesnot rings, that’s because this is a mechanical timer, you didn’t wind up firstly. Please follow the two important steps, it will rings: Step 1: "Wind Up". You MUST wind the timer from 0-55 ; Steps 2: "Set Time". Wind the timer from 55 back to the time you want to set. Wonderful gift,sweet warm gift for friend family and yourself. Specifications: Materials:metal+ABS+magnet Color:01,02 Package Includes: 1Piece Mechanical Kitchen Timer note: Please allow 1-2cm errors due to manual measurement. Due to the differences betweeen different monitors,the picture may not reflect the actual colour of the item.