Waterproof 5atm &amp; IP69K, and obtained IP69K certification 380mAh large battery, standby time over 50 days, daily use time over 15 days Latest heart rate sensor heart rate HRS3690, heart rate test accuracy is comparable to Apple and Huawei Newly designed dynamic user interface, support split-screen display 1.72 inch clear screen, 280*320 resolution, give you a better visual experience M1 Smartwatch Multifunctional KOSPET Tank Smart notifications for incoming calls, app text messages (WeChat, QQ, Weibo, Facebook, Twitter, WhatsApp, Line, KakaoTalk, Instagram, Skype, etc.). Sleep monitoring, pedometer, sedentary reminder, alarm clock, weather, music/music control, 24-hour heart rate monitoring, blood pressure monitor, blood oxygen monitor. Bring your life more convenience. Smartwatch Languages English (default), French, German, Italian, Spanish , Portuguese, Russian, Japanese, Korean, Oman, Ukrainian, Arabic, Turkish, Roman Bluetooth Version: Bluetooth 5.0 Chip: RealTek8762DK Memory: 64KB RAM + 128M ROM < p> Waterproof: 5atm and IP69K waterproof Display: screen 1.72 inch TFT, 280*320 resolution Battery: 380mAh polymer battery Battery life: 15 days daily use, 50 days standby Connect phone app name Phone: Da Fit Support compatible connection mobile phone version: IOS 10.0 and above, Android 5.1 and above Strap Size Width: 20mm (Support Replacement Strap)