Garmin vivosmart 4 Activity & Fitness Tracker with Advanced Sleep Monitoring and Pulse Ox Sensor, Midnight Black-Small/Medium (Renewed) The garmin vivosmart 4 is an activity tracker that learns your activity level and assigns a personalized daily goal It features a slim and stylish design that blends fashion with style with metal accents and a bright, easy-to-read display Track activity, monitor your heart rate, get smart notifications, and even access detailed fitness monitoring tools such as VO2 max estimate and your fitness age This helps gauge blood oxygen levels with its wrist-based Pulse Ox feature It follows your progress 247, and it can stay on for 7 days without a battery charge Each time you receive a text, email or call from your compatible Bluetooth device, vAvosmart 4 gently vibrates and automatically displays the informationVivosmart 4 Features:Smart Activity TrackerStylish Designong Battery LifeInactivity IndicatorsWrist-based Pulse OxAdvanced Sleep MonitoringBody Batteryisplayarmin connect compatibleHeart Rate Monitor:Vibration AlertsShows TimeStep counterAuto goalusic controlove BarTrueUpove IQAuto LapV02 maxWater Swim RatingRechargeable Lithium Battery64 x 128pixels OLED DisplayemoryHistory: 7 Timed Activities, 14 Days of Activity Tracking Dataclock FeaturesSensorsBluetooth Smart & ANT+ connectivitySmart NotificationsWeatherind My Phone & Find My Watch SupportVIRB remoteSmartphone compatibility: iPhone, Android