Hesvit Multi Sport Fitness Tracker Wristband Watch for Activity Tracker Bracelet/Fitness Watch Compatible with Android and IOS System (Black) Multi-data Monitoring--- Meet the world's smartest training devicethe Activity Tracker Watch.It has twelve functions so you can monitor your Activity Tracking (steps, distance and calories burnt), Sleep Monitoring, Health Monitoring (heart rate, skin/wrist temperature), Environment Monitoring (wrist humidity, ambient pressure), Important Cycle Reminders and other important data while you are exercising. One free Data Cable as a gift for you. 2016 Perfect Design---Use alone without phone, all in one screen, patented technology, with over hundreds patents pending, automatic and manual measurement. 24hrs monitoring the exercise, sleep, physical and environmental condition, easily to handle a healthy life. 30m waterproof, can prevent the rain,but remember avoid flush with large amounts of water.smartband can synchronize with mobile phone, every time the band with mobile phone synchronization, hand band automatic synchronization time. Heart Rate/Sleep Monitoring---Screen flash for 10s when heart rate is over 100 bpm, automatic on-the-hour or manual test, with exclusive patent more accurately test the static heart rate. Also automatically detect shallow sleep and deep sleep time. Help you understand your sleep cycle as well as improving your sleeping quality. Press the  botton 2 to 6 seconds, next to the "has" "-" flashing is loosen, began to test the heart rate. Wireless Sync with Free APP---Sync data via Bluetooth with iOS and Android smart phones. OS must be IOS 7.0(or above) and Android 4.4(or above) phone which with Bluetooth 4.0.One app can connect with multiple wristbands, so as to know all family's healthy condition anytime. Long Battery Life--- 4-5 days endurance by 2-hour micro usb full charge. Band length can be adjusted from 5.91 - 9.06 inch to wear, enough for every wrist for kids men and women.18 Month Warranty.