Nubia Curved OLED screen Smart Watch, SW1003. Brand: Nubia. Model: SW1003. Product Item: Smart Watch. Color: Black. Gender: Unisex. Display Type: Curved OLED screen. Display Size: 4.01 Inches. Features: Bluetooth, Bluetooth LE, GPS, Accelerometer, AMOLED, NFC Operating System. Compatible OS: Android 4.4+, iOS 9+Networks. 4.01" Flexible Display, Customizable Watch Face, Scrolling Text Display, Multi-Sports Modes, Heart Rate Monitoring, Sleep Tracking, Sedentary Reminder, IP54 Dust & Water Resistance.