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Slim smart activity tracker blends fashionable design with stylish metal accents and a bright easy-to-read display Includes advanced sleep monitoring with REM sleep and can gauge blood oxygen saturation levels during the night with the wrist-based Pulse Ox sensor. Not a medical device and not intended for use in the diagnosis or monitoring of any medical condition Fitness and health monitoring tools include estimated wrist-based heart rate all-day stress tracking relaxation breathing timer VO2 max Body Battery energy monitor and more Features dedicated activity timers for walks runs strength training yoga pool swims and others Get 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 vvosmart 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 youre sleeping or you can spot-check your oxygen levels anytime during the day. this is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition The device also monitors heart rate at the wrist and includes such helpful tools as all-day stress tracking a relaxation breathing timer and VO2 max readings. Plus Body Battery energy monitoring helps you know when youre primed to be active or when you may need to rest. Safe for the pool or shower vvosmart 4 keeps you going strong with up to 7 days of battery life while smart notifications with vibration alerts help you stay connected on the go when connected to a compatible smartphone.