INCREDIBLY ACCURATE HEART RATE MONITOR. The smart bracelet monitors your heart rate for 24-hour. Do exercises with specific heart rate monitor and it will record and analysis your heart condition data in the APP. It's a really good health assistant, but can't be used as a professional medical heart rate monitor chip. GUIDE BREATHING TO RELAX YOURSELF. The fitness tracker will guide you to adjust your breathing through inhale, hold breath and exhale three steps when your heart rate is too high or you want to relax better. MULTI-FUNCTIONS LET YOUR LIFE BE MORE CONVENIENT. Its functions contain multiple-sport modes, GPS tracking, sleep monitor, pedometer, distance, calories, weather report, call & message notification, sedentary reminder, and so forth. The steps, heart rate and other activity data can be synchronized to Apple health APP or Google fit APP. HUMANIZED DESIGN AND COMFORTABLE MATERIAL. It's designed with a home button on 0.96 inches OLED full touch screen, USB wireless charging and IP67 grade waterproof. Metal buckle is designed for wearing more steadily. The wristband is made of high-quality TPU material that is softer and more durable. WIDER COMPATIBILITY. The smart watch works collaboratively with iOS 7.1 or above & Android 4.4 or above. It can support the devices such as iPhone X/8/8plus/7/7plus, Samsung Galaxy S7 edge/S8/S8+/S9/S9+/Note8/Note7/A8/A9/A9 Pro/J7, Sony Xperia XZ Premium/Xperia XZ1, Moto Z/Z2018/M, and so forth.