The Haylou Watch 4S features a 1.43-inch AMOLED display, Bluetooth 5.3 connectivity, and 5-system GPS. Key specifications include a 400mAh battery offering up to 10 days of daily use, 1ATM water resistance, and comprehensive health monitoring like heart rate, SpO2, and sleep tracking. It also supports Bluetooth calling, voice assistant, and over 120 sports modes. Display Size: 1.43-inch Type: AMOLED Resolution: 466 x 466 pixels Brightness: Up to 1000 nits Glass: 2.5D curved, scratch-resistant Design and build Weight: Approx. 62g (with strap) Material: Aluminum alloy rotating crown Water Resistance: 1ATM (suitable for rain, sweat, and hand washing, but not for swimming) Connectivity Bluetooth: V5.3 GPS: 5-system (GPS, BeiDou, GLONASS, Galileo, QZSS) Compatibility: Android 9.0 and iOS 13.4 App: Haylou Fun
