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Haylou Watch 4S – Technical SpecificationsDisplayScreen Size: 1.43-inch AMOLEDResolution: 466 × 466 pixelsBrightness: Up to 1000 nitsGlass: 2.5D curved, scratch-resistantDesign & BuildMaterial: Aluminum alloy rotating crownWeight: ~62g (with strap)Water Resistance: 1ATM (rain, sweat, hand wash)ConnectivityBluetooth: 5.3Compatibility: Android 9.0 , iOS 13.4 GPS: 5-system (GPS, BeiDou, GLONASS, Galileo, QZSS)Battery & PerformanceBattery Capacity: 400mAhBattery Life:Up to 18 days (basic mode)Up to 10 days (daily use)Up to 26 hours (GPS mode)Charging: Magnetic chargerHealth & Fitness TrackingHeart Rate Monitoring: 24/7Blood Oxygen (SpO2) MonitoringSleep Tracking (deep, light, REM)Stress MonitoringMenstrual Cycle Tracking120 Sports ModesSmart FeaturesBluetooth Calling (answer/reject calls)Voice AssistantNotifications (calls, SMS, apps)Remote Camera ControlCustom Watch Faces (200 options)Find My Phone/WatchAdditional FeaturesSedentary ReminderBreathing ExercisesWeather ForecastStopwatch, Timer, AlarmDo Not Disturb ModeFlashlightIncluded AccessoriesReplacement strapScreen protectorMagnetic chargerQuick start guide Download