1) SMA Smart Fitness Watch Bluetooth Heart Rate Monitor Smartwatch for iPhones Android Women Men. Watch is one year warranty including replacement strap if strap is broken in one year please email us we will send one free replacement strap to you.</br>2) Two Modes Dynamic Heart Rate Monitor: a) Repeat: Monitor heart rate 24 hours a day. b)Once: Real-time heart rate monitor. Standard 22mm watchband you can replace it at will.</br>3) IP54 waterproof and anti-splash support wash hand and wear in the raining day. One year warranty. Battery 1-2 days standby charge once same as Apple iWatch.</br>4) Function:Track StepsCaloriesDistancePaceGoalSleepSedentaryAnti-Lostremote cameramusic playcall dialcall logssirivoice recorderstopwatchcalculatorphonebook sync Email/Twitter/Facebook message reminder message reply by template words in watch only for Android phone Support 8 alarms setting vibration/ring reminderNever miss any important meet again.</br>5) Compatibility: Android 4.3 iphone 5/5s/6/6s/plus/7/plus or above iOS 8.0 or above?? Bluetooth 4.0 or above. And one year warranty. Any question with the item?? please email to: maggie@smawatch.com??we will reply within 12 hours?? solve question within 24 hours.</br></br>Product Description</br></br><b>SMA Smart Fitness Watch?? Bluetooth Heart Rate Monitor Smartwatch for iPhones Android Women Men (Black) </b> <br><b>YOUTUBE smart watch function description