【Adapt to all kinds of wrists】There are 3 wrist circumference sizes to choose from, thin wrist: 15~16.5cm, medium wrist: 17~20cm, thick wrist: 19.5~21cm. You can find a rope to measure the circumference of your wrist, and then choose the right size. 【Operation mode】The watch winder runs in an automatic 3-hour operation and 9-hour rest cycle, helping maintain automatic mechanical watches during storage without frequent manual winding. 【USB Powered Use】Powered by a standard USB connection, this watch winder works without batteries and supports convenient long-term use on a bedside table, desk, or display shelf. 【High-quality materials】colorless and odorless, made of edible grade plastic material, full of toughness, can't break, solid material carving technology plus handmade technology. 【Watch Winder】If a watch is not worn for a long time, it will accumulate oil and shorten its service life. If it is left lying around, it will be easily contaminated by dust. If you want to maintain the performance of your watch and make it look new over time, it is important to choose the right watch winder.