E-TECNING Multifunctional Waterproof Smart Wristband Bracelet Wireless Activity Fitness Tracker Watch With Heart Rate Pedometer Sleep Monitor(Black) Multi-data Monitoring -- 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. 2016 Perfect Design -- Usable 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. 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. Wireless Sync with 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 -- 7-10 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.