Item Type Smart WatchWaterproof rating IP68 Screen size 1 28inScreen type TFT LCD round color screenScreen cover high hardness glass coverMaterial of bottom shell zinc alloyWristband material SiliconeRetaining ring silicone single colorBuckle 303 stainless steel polished surfaceWatch Size L x W W x H about 46 9 11 8 260mmBody Size L x x W x H about 46 9 11 8 51mmWatch weight about 75 5gScreen resolution 240 240 resolutionWorking voltage 3 7VBattery capacity 200mAhBattery type polymer lithium batteryCharging method contact charging clip chargingCharging time ≤2 hours 25 ℃ constant temperatureCompatible for IOS 9 0 and above for Android 4 4 and aboveWorking temperature 20 ℃ to 40 ℃Charging temperature 0 ℃ to 40 ℃Multi language English Simplified Chinese Traditional Chinese Japanese French German Italian Spanish Russian Portuguese Malay PolishFeatures Improved AccuracyThe dual LED bio tracking optical sensor combined with intelligent hr algorithm sensor to ensure 7 24 real time heart rate tracking accuracy and consistency making the smart watch for Vigorun more intelligent than ever and analyzing to track your sleep for helping you adjust your healthy lifestyle 10 Days Battery LifeThe fitness watch equipped with 200mAh battery and low power consumption chip that can run for more than 10 days in only 2 3 hours of charging time Your Swimming PartnerThe watch is 50 meters waterproof and military standard durability can help yo