Gain insight into your body's energy levels with the black Jaybird Reign Fitness Tracker in large/extra large. This smart wristband measures your activity and heart throughout the day and then gives you a score the next morning that tells you how ready you are for physical activity that day. This is accomplished by measuring the variability in time between each of your heartbeats with the built-in heart rate monitor and detecting patterns of fatigue or recovery.
The Reign recognizes your activities automatically and, when connected to your Android or iOS device, presents a summary of your day. By calculating the amount of time and energy spent walking, running, swimming, biking, general sports, or being inactive, your Reign will show you your activity score and what percentage of your day was spent active. To promote healthy sleep, the Reign automatically recognizes when you're sleeping, records relevant data, and then informs you of how much sleep you'll need the next night to be fully rested.
The Reign is water-resistant and its silicone band clips together with magnetic pin-locking chrome clips. Its battery lasts for up to five days and can be recharged with the included charger. Also included are a pair of premium bands, a pair of sport bands, an ankle strap, and a clip cleaning brush.