Key Features. Advanced sleep monitoring Fitness & health monitoring Activity timeer for walks runs yoga & many other activities Get notifications on your wrist Up to 7 days battery life Safe for swimming & showering. Stylish smart design This slim wristband tracker available in multiple colours complements your style with its distinctive design metal trim accents & bright easy-to-read display. The display is only on when you need it. & when it's on it auto-adjusts to ambient light levels so it's visible even in bright sunlight. Whether you're going to the office the gym the pool or anywhere in between vívosmart 4 is the perfect fit for your lifestyle. Pulse Ox at your wrist The Pulse Ox sensor on vívosmart 4 estimates your body’s blood oxygen saturation level. Your Pulse Ox measurements are dependent upon a number of factors including your overall health & fitness. Checking your Pulse Ox can help gauge how your body is absorbing oxygen. Turn on the feature to gauge your Sp O2 overnight or use it to take a spot measurement anytime to learn more about your body. Advanced sleep monitoring Sleep is important to your overall health well-being & physical performance. To give you an idea of how you’re sleeping vívosmart 4 tracks your light deep & REM stages of sleep along with movement throughout the night. For added insight turn on the Pulse Ox feature to view your blood oxygen levels during your sleep. When you wake up you can easily review & compare your sleep stats in the Garmin Connect™ Mobile app. Optimise your body's energy Body Battery energy monitoring on vívosmart 4 uses a combination of stress heart rate variability (HRV) sleep & activity data to gauge your body's energy reserves at any moment so you can plan your day to optimise times for activity & rest. A higher number indicates you're ready to be active while a lower number suggests you might need to relax & rest a bit before tackling a workout. Body Battery can also help you make sense of patterns throughout your weeks so you can understand how the past few days have influenced how you're feeling today. All-day stress tracking You most likely experience stress at some point in your day but how much? Your vívosmart 4 lets you know when you are having a calm balanced or stressful day & everything in between. Tracking your HRV (the time interval between each heartbeat) vívosmart 4 calculates & displays your stress level. There's also an optional Relax Reminder feature that you can turn on in the Garmin Connect app. If your stress level gets elevated during your day it will provide a vibration alert on your wrist & display a message (Take a moment to breathe?) to let you know it's time to relax. Use the relaxation breathing timer which walks you through the Fourfold breathing technique proven to calm your mind & body..