Color:Black  |  Size:S/M Track Your Wellness and Fitness Activity with StyleSlim, smart activity tracker blends fashionable design with stylish metal accents and a bright, easy-to-read displayIncludes advanced sleep monitoring with REM sleep and can gauge blood oxygen saturation levels during the night with the wrist-based Pulse Ox² sensorFitness and health monitoring tools include wrist-based heart rate, all-day stress tracking, relaxation breathing timer, VO2 max, Body Battery™ energy monitor and moreFeatures dedicated activity timers for walks, runs, strength training, yoga, pool swims and othersGet vibration alerts for all notifications, including calls, text messages and more (text replies available for Android device users)Battery life keeps up with you; lasts up to 7 days (excluding Pulse Ox sleep tracking) and is safe for swimming and showering, too.Accent your style while enhancing your fitness with our vívosmart 4 activity tracker. This slim, swim-friendly wearable comes loaded with fitness and wellness features to help you make the most of a healthier, more active lifestyle. A wrist-based Pulse Ox sensor lets you estimate blood oxygen saturation while you’re sleeping — or you can spot-check your oxygen levels anytime during the day. The device also monitors heart rate at the wrist and includes helpful tools such as all-day stress tracking, a relaxation breathing timer and VO2 max readings. Plus, Body Battery energy monitoring helps you know when you...