General - Brand: YESIDO. - Model: IO31. Display - Screen size: 1.43 inch. - Screen type: AMOLED. - Resolution: 466 × 466. - HD Touch Screen. - Water Splash-Resistant. Platform - OS: Android 5.0 and more, iOS 9.0 and more. - APP: Yesido Fit. Connectivity features - Bluetooth version: 5.2 Technical Specifications - Material: Zinc Alloy. - Main Control: AD7012. - Touch Chip: H816D. - Sensor: LC09A/DA267-LGA12. - Flash: 128MB. Battery - Battery Capacity: 280mAh. - Long Duration: About 10-15 Days. - Charging Time: About 3 Hours. - Charging method: Magnetic Charging. Activity tracking function - BT Calls. - Sports modes. - Sleep Monitoring. - Reminder Of Long Sitting. - Clock Display and Weather Forecast. - Bluetooth Music Control Music Playback. - Step Count, Calories, And Mileage. - Heart Rate, Blood Oxygen, Blood Pressure, (Not A Medical Device; Values Are for Reference). - Stopwatch. - Wrist Raise to Wake Screen. - Physiological Assistant and Reminder him. - World Time: View Real-time in Different Time Zones Around the World. - Supports Multiple Languages. Band - Number: 2 Strap. - Material: Anti-static silicone strap. - Changes: Yes. - Color: Black.