Easy to use activity tracker features an always-on color display. Size large. New condition (never used). In box. One -year battery life. Incudes sunlight readable display, auto activity detection, auto goal, move bart alert, sleep monitoring, find my phone. Can be worm while swimming. Product Key Features Number of Items in Set1 Power SourceBatteries SizeS, M Battery LifeUp to 5 Days SensorsAccelerometer, GPS Sport/ActivityGym & Training Display Resolution161 x 160 ColorBlack Indoor/OutdoorIndoor/Outdoor Measurement SystemDecimal For Operating SystemsWindows, iOS, Other OS, Android Measurement ProvidedCalories, Time, Heart Rate, Distance, Speed Display Size4 LanguageFrench, English, Spanish Body AreaWrist FeaturesMulti-Sport, Smartphone Compatibility MaterialPlastic TypeActivity Tracker Dimensions Item Height0.4 In. Item Weight0.26