Description About Product HEART RATE MONITOR: Optical heart rate sensor, records to understand your own energy consumption. ACCURATE TRACKING: It can tracks your daily activity with heart rate monitoring likes steps, distance, calories burned, floors climbed and active minutes, also has many helpful functions like sleep monitor, smart alarm clock, sedentary alert, finding phone, anti-lost alert. COMPACT DESIGN: Built-in 0.66 inch OLED display screen, you can check anytime and clear to glance. It looks fashion and thin. Silicone watchband with adjustment holes, wear it comfortable and valuable. FAST CHARGING:support Bluetooth:BLE 4.0.It is convenient to charge your bracelet, 3 point connect charge. You can charge well anytime and anywhere . INTELLIGENT ALERT:It is convenient to obtain the call, SMS, and other information. You will not need to worry about missing any of them when you are taking exercise. There is also s sedentary alert function that can remind you be aware of long-time sitting. Some Specification Sensor: G-Sensor Screen Size: 0.66''OLED Bluetooth: BT 4.0 Strap: TPE Battery: 100mAh Standby time: 5-10 days Charging time: About 30-45 minutes Waterproof: IP67 Excellent Features 24h real time heart rate monitoring. Cardiopulmonary fitness level. Guided breathing. CPU: Nordic