Wireless Communication Standard Bluetooth Color：Purple，Pink，Green-Gold，Green，Gray，Dark Purple,Black Connectivity Technology：Bluetooth Operating System：IOS 8.0/Android 4.4 or above and Bluetooth 4.0 or later Band Color：Purple Compatible Devices：Smartphone Human Interface Input：Buttons Water Resistance Level：Waterproof Batteries：1 Lithium Metal batteries required. (included) OS：IOS 8.0/Android 4.4 or above and Bluetooth 4.0 or later Wireless communication technologies：Bluetooth Connectivity technologies：Wireless GPS：NO Other display features ：Wireless Device interface - primary：Buttons Item Weight：5.6 ounces Product Dimensions：15.99 x 8.99 x 1 inches ♥【Smart watch for Android Phones Samsung iPhone】- Compatible with most iOS 8.0 & Android 4.4 above smartphones. Download and install Free "VeryFitPro" APP, bind this smartwatch in your cell phone,you can receive alerts of calendar, SMS, incoming calls and SNS (Facebook, WhatsApp, LinkedIn, Instagram, Twitter and more) on this watch;It will never let you miss any important things. ♥【Accurate Fitness Tracker】- Supports 9 sports such as Walking, running, bicycle , Hike, Mountaineering, Dynamic cycling, fitness, treadmill, Yoga. Accurately record all-day activities like steps, distance, calories burned, miles walked, active minutes. Can track all your workout routes, distances, and physical status during exercise. Stay motivated all day! ♥【24/7 Heart Rate Monitor & Sleep Tracker】- Automatically monitor your real-time heart rate, and provide comprehensive analysis of your sleep quality (deep sleep,light sleep and wake up time) to help you develop a healthier lifestyle. ♥【Waterproof Fitness Watch & Long-Lasting Battery】- Willful smart watches is designed with IP68 waterproof rating,which allows you to swim in the pool with it with no worries(NOTICE:It can not track your swimming data). Large capacity and low power consumption design offers longer endurance.It support 7 days of normal use and 30 days standby time ♥【More Practical Tools & App Details】- Willful smart watch also features with many practical tools,such as alarm clocks,stopwatch,timer,deep breather guide,music controller,sedentary reminder,adjustable brightness,find phone.The APP's name is VeryFitPro,which works with Android 4. 4 or iOS 8. 0 and above,Bluetooth 4. 0 and above smartphones only, not for pc or tablet.