JiuChoi &trade; BW-1 Bluetooth Smart Heart Rate Bracelet Watch IP54 Sport Continuous Heart Rate,Blood Pressure,Fitness Step Tracker,Sleep,Fatigue State,Emotional Status Functions Supports Smartphone Android 4.3 IOS 7.0 or Above High-frequency tracking of continuous heart rate function helps steady tracking of heart rates in a given period of time under any circumstances. Detection of your physical parameters including blood pressure, pulse, emotion and tiredness indexes, offering you health advice. Soft and adjustable silicone strap make a elegant appearance, a bracelet combines with art and technology. 157mAh battery,Long Standy. At night, it tracks your sleep cycle. Let you know how long and how good you sleep, to help you improve your sleep quality. Choose a smart health partner, manage your healthy, built a good life. It is also a perfer gift for your friends and family.