I purchased this in April of this year for 13,890 yen and used it for 1-2 weeks before storing it. I'm selling it because I don't use it. I'm open to price negotiations (^-^) Feel free to contact me! Operating System: Android Memory Storage Capacity: 128 MB Features: Compatible with iPhone & Android Battery Capacity: 300 milliamp hours Connectivity Technology: Bluetooth [Sapphire Glass & AMOLED Equipped & Glossy Colors] The vibrant AMOLED screen of the FOSMET W1 offers excellent visibility, and the sapphire glass is incredibly smooth, allowing for comfortable swiping. The band can be easily swapped between two types, making it perfect for a first ladies' watch or everyday use. The simple, timeless round design works well in a wide range of situations, from the office to casual settings. [Manage Your Sleep for a Better Day] In addition to menstrual cycle management (※ cycle settings are done on the app side), the popular FOSMET W1 smartwatch for women is recommended for those who want to aim for high-quality sleep. This smartwatch allows you to "visualize" the quality of your sleep as numerical data, so you can objectively understand your sleep patterns (deep sleep, light sleep, REM sleep). By accumulating daily sleep data, it's easy to feel the changes and maintain motivation for improvement. Furthermore, it also features heart rate and blood oxygen level recording functions, making it even more appealing for more detailed sleep analysis. First, by establishing a habit of monitoring your daily sleep, you'll naturally lead a life where you "become aware of sleep quality." [Unlimited Watch Face Choices & DIY Watch Faces & Always-On Display] This stylish smartwatch has an always-on display with a design that is ahead of its time, making the watch itself a fashionable item. You can further enjoy fashion by customizing the watch face. You can freely select from over 150 watch faces through the app. Furthermore, it supports both analog and digital AOD (always-on display) watch faces, making it convenient to check the time without turning on the screen. [Amazing Ultra-Large Capacity Battery] It can be fully charged in about 2 hours and can be used continuously for 5-7 days with normal use, and up to 15-20 days in standby mode! (We've packed a large-capacity battery into just the right size.)