HAYLOU Watch 4S Smart Watch
The Haylou Watch 4S is an affordable smartwatch featuring a 1.43-inch AMOLED display, built-in 5-system GPS, Bluetooth calling, and a multi-sensor health suite. It was released in July 2025 and is known for a long battery life and a premium design that includes an aluminum alloy rotating crown.
Design and display
Display: The Haylou Watch 4S features a 1.43-inch HD AMOLED screen with a 466 x 466 pixel resolution, capable of reaching up to 1000 nits of brightness. A scratch-resistant 2.5D curved glass protects the display.
Build: Crafted from aluminum alloy, the body is lightweight at 62g (including the strap) and includes a tactile rotating crown for navigation.
Durability: The watch has an 1ATM water-resistance rating, making it suitable for daily use, including rain, sweat, and handwashing.
Performance and connectivity
GPS: For accurate location tracking, the Watch 4S includes a built-in 5-system GPS that supports GPS, BeiDou, GLONASS, Galileo, and QZSS.
Connectivity: It uses Bluetooth 5.3 for a stable connection to your smartphone and is compatible with devices running Android 9.0+ or iOS 13.4+.
Battery: The 400mAh battery provides an impressive battery life, which Haylou claims can last up to 18 days in basic mode, 10 days with regular use, and 26 hours with continuous GPS tracking.
App: The Haylou Fun app syncs all health and fitness data and allows for settings customization.
Health and fitness tracking
Comprehensive monitoring: Equipped with multi-channel bio-sensors, the watch provides 24/7 heart rate monitoring, SpO2 (blood oxygen) tracking, sleep analysis (deep, light, and REM), and stress monitoring.
Sports modes: It offers over 120 sports modes to track various workout activities.
Menstrual cycle tracking: A dedicated feature tracks and logs menstrual cycles.
Smart features
Bluetooth calling: You can answer and make calls directly from your wrist.
Voice assistant: The built-in AI voice assistant allows for hands-free operation.
Notifications: Receive real-time alerts for calls, SMS, and app notifications.
Customization: Choose from over 200 custom watch faces to personalize your device.
Other tools: Includes handy features like remote camera control, a flashlight, weather forecasts, a stopwatch, and a “Find My Phone/Watch” function