LUOOV OLED Waterproof Bluetooth Smart Sports Bracelet Fitness Tracker with Sleep Monitor Heartrate Smart Wirstband for iPhone & Android (Gold) Compatibility: requires Android 4.3 or above, iOS 7.0 or above,Bluetooth 4.0.Download APP "HPlus Watch" from Apple Store or Google Play for free OLED Display: 0.91 inch OLED screen allow you to check time, date, steps, calories, working distance, message, Heart rate quality easily. Snyc Data: When bluetooth paired, you can sync your data to Andriod/IOS phone. It gives you real-time assessment of your exercise throughout the day Multi Functions: track steps, walking distance, calories burnt, sleep quality,heart rate monitor,Call/SMS Reminder..Also can be set alarm to remind of getting up, drinking or sedentariness,and Anti-lost. We promise: 30 days return and exchange, 12 month warrantly. So please be secure to purchase.