1. Mechanical design: The mechanical clockwork design makes it work without batteries, environmental protection, and long service life.2. Magnet design: easy to place, the magnet on the back can be adsorbed on ferrous objects such as refrigerators and microwave ovens.3. Ribbon design: The ribbon area on the dial makes it easier to recognize even when the pointer is moved a certain distance away.4. Volume reminder: The volume is clear and can be used in multiple scenarios, such as cooking, learning, physical exercise, and playing games.When using it, please strictly follow the following instructions. If you do not use it as required, the timer will be damaged or will not work: 1. Every time you use it, you need to rotate the timer hand clockwise above the 55 scale (do not exceed 0 Scale; 2. Turn counterclockwise to the countdown time you need to set. Product description Color:Green This mechanical timer does not require batteries, is environmentally friendly and can be used for a longer time. The sound reminder is clear and nice, and can be used in many scenarios, such as cooking, baking, learning, and exercising. The magnet on the back is convenient for you to put on the refrigerator or microwave oven, and it is not easy to lose. Retro and exquisite shape can better decorate your home. Please strictly follow the instructions when using: 1. Every time you use it, you need to rotate the timer hand clockwise above the 55 scale (do not exceed the 0 scale); 2. Rotate counterclockwise to the countdown time you need to set.