G20 1.3 inch IPS Color Screen IP67 Waterproof Smart Watch, Support Blood Oxygen Monitoring Sleep Monitoring Heart Rate Monitoring, Style: Silicone Strap(Grey) 1. Material: watch back case: plastic + acrylic heart rate lens, middle frame: zinc alloy 2. Memory: 128M+64M 3. Main screen: 1.3 full circle HD IPS, resolution: 240*240 4. Bluetooth version: BLE 4.0 5. System requirements: Android 4.4 versionIOS8.0 version and above 6. UI interface language list: Chinese, English, French, Spanish, Portuguese, Italian, Japanese, German, Russian, Thai, Turkish, Arabic, Czech, Greek 7. Information push languages: Chinese, English, French, Spanish, Portuguese, Italian, Japanese, German, Russian, Thai, Turkish, Arabic, Czech, Greek 8. Functions: information push, heart rate detection, blood pressure detection, phone address book, answering a call, hanging up a call, call reminder, sedentary reminder, exercise mode, Bluetooth music playback, sleep monitoring, phone search function, anti-lost reminder, remote photo Wait 9. Watch circumference: 275mm, size: 54.5x46x11.8mm