Feature: Greencell Heart Rate Algorithm: 24/7 continuous heart rate monitoring to ensure high ef�ciency and low power consumption, combined with accurate algorithms to effectively �lter noise interference Sleep tracking . Stages: See how long you're in light, deep and REM sleep and get personalized insights to learn how to get better rest All-Day Activity Tracking: Every part of you: day matinee—track steps. distance. active minutes and calories burned It Has Your Back Wherever It Might Be: Robustly build, with smart features that are compatible with iPhone 8 Android Phones and long battery life Large Color Display: It comes with a 1.3-inch bright color touchscreen that provides incredible color depth, and exceptional clarity. Give you the best viewing experience wherever you go, and whatever you do. Specification: Water resistant: IP67 Waterproof Pls do not wear it when taking a shower or go swimming do not press any buttons under water. Screen Size: 1.3 inch Screen type: IPS Color Touchscreen display Resolution: 240*240pixel Compatible OS: Android iOS Compatability: Android 4.4 / iOS 8.0 and above system APP Name: H Band Sensor: Heart-rate monitor,Proximity sensor,Accelerometer Heart Rate: GREENCELL Heart Rate Algorithm Type of battery: Built in battery Battery Capacty: 180mAh Standby time: 7-10 days Charging time: About 1.5 hours Case material: Zinc alloy frame Straps material: 22mm Hrybrid leather straps Suitable for wrist size: 135 - 230mm Standout Features: 24/7 Heart Rate, Blood Pressure, Steps calories, CountDown, Female health, Call rejection, Exercise tracking, Real-time pace distance, Smartphone Notifications, Sleep tracking, Stopwatch, Findphone, Alarm clock, Multi-watch faces Package List: 1 x Smart Watch 1 x Charging Cable