[Product Information] Brand: OLEVS Materials: glass [Product Description] ・Quartz movement: Uses quartz and has high time accuracy. Case thickness: 11 mm, diameter 42 mm. Band length: 21 cm (band adjuster included). Luminous function allows you to see the time clearly even at night. ・30M waterproof function: It has waterproof performance that can withstand everyday water droplets such as sweat and rain, so please refrain from using it for water work, water sports, skin diving, etc. ・Perfect gift: Gives a light and sophisticated image for business, meetings, and is the perfect gift for festivals and anniversaries. Check out our stylish and stylish gifts ・Usage warranty: Products purchased on Amazon come with a 30-day replacement guarantee and a 1-year warranty period (does not include damage caused by external force). [Important Note - For Overseas Customers] Thank you for purchasing this product. Please read the following important notes carefully before using this product overseas. 1. Legislation and safety standards This product complies with Japanese safety standards. Please check compatibility with local regulations and safety standards before use in your country. Certain product categories (electronics, cosmetics, food, etc.) may require certification from the importing country. 2.About electrical products This product complies with Japanese power specifications (100V, 50/60Hz). If your country has different power specifications, you will need an appropriate transformer or conversion plug. Using an inappropriate power source may cause malfunction or accident. 3.Language and manual Product instructions and displays may only be in Japanese. The English version of the manual can be downloaded from our website. 4. Warranty and after-sales service International warranty coverage is limited. Please check the warranty for details. After-sales service and repair support overseas may be limited.