Akasma focusing on smart wearable devices as well as fitness technology long for 10 years?strive to guide a creative, stylish, quality and healthy life. Akasma fitness tracker watch, such an amazing helper at your home workout as well as outdoor sports. So far, Over millions of global people are using Runmifit APP! It provides brilliant aid on your personal health management, letting you record all kinds of data that make sense of the information the tracker collects. Highlight Features:Heart-Rate MonitorSleep TrackingCall, SMS & SNS NotificationColor TFT displayCamera controlReminders to Move and workout home gymFour sports modes: walk, run, hiking, cyclingFully capable IP68 for daily waterproof and swimming.Specifications:Model: S5Suits for wrist size: 4.7 inch - 7.8 inch / 120 - 200 mmBluetooth version: Bluetooth 4.0 or laterBluetooth transmission distance: 10 Meters (32.8 feet)Working time: 5-7 daysCharging method: USB chargingCharging time: 1-2 hoursNet weight: 0.5lbAttention: When charging, make sure you put the right side, the charging function is only available at the lower end of the dial. Try the front and back sides, the metal piece facing forward or backward and plug in a different socket to see if it can be charged properly.