Compatible with Android & iOS PhonesSmartwatch is compatible with most Android 5.0 and IOS 9.0 and above. Supports Bluetooth 4.0. Connect the watch to your device via the "Da Fit" app and you can get real-time notifications of calls, SMS, and SNS messages including EMail, Facebook, Instagram, Twitter, WhatsApp, QQ, Wechat, Linkedin, Messenger, and more. It won't let you miss anything important. (Note: you cannot reply to messages or calls) 24/7 Heart Rate Monitoring & Sleep Trackingheart rate monitor watch monitors your heart rate and oxygen saturation throughout the day, and the automatic sleep tracking function of Bluetooth smart watch for men can monitor your sleep status (deep sleep, light sleep, and wake up time), which can help you better understand your health condition and make reasonable adjustments to your lifestyle. More Useful FunctionsAll messages and notifications will be displayed on your wrist and remind you by vibration. There are also many useful functions such as timer, wake-up gesture, mobile phone search, sedentary reminder, music control, weather display, women's smart watch, etc., which support women's menstrual reminder. (Note: you cannot reply to messages or calls) IP68 Waterproof & High Endurance BatteryIP68 waterproof watch fitness tracker supports multisport mode: walk, run, swim, cycling, etc to give you a more detailed insight into whole day activity. 230 mAh battery, 1-2 hours charging, low power consumption and long standby time, 7-10 days of normal use, and 15-30 days standby time. (Please do not use it in hot water.) 1.32-inch with Personalized fitness watch1.32" touch screen and HD round glass that is robust and scratch-resistant. The smartwatch includes 5 main dials to choose from at any time, as well as a further 100 dials to choose from in the "Da Fit" app. You can also customize the background of your watch face.