This fourth generation smart watch features a 1.91 inch HD display, voice calling, one-button connection, 24-hour heart rate monitoring, nighttime blood oxygen saturation, 24-hour blood sugar monitoring, 24-hour blood pressure monitoring, sleep tracking, and over 50 sports modes with fitness tracking. It also supports the Tuya app, allowing for all smart devices to be controlled in one place. APP: H Band Master chip: JL7013A+ 64M FLASH Gsencor sensor: KTJ3-1057 APP supports: 19 countries: English Chinese Simplified Chinese Traditional Korean German Russian languages: Spanish Italian French Vietnamese Portuguese Persian Polish Turkish Czech Slovakia Watch support: Dial language: English, Chinese, Japanese 9 countries: (support 150 countries to language: customize) Simplified Chinese, Japanese, English, German, French, Portuguese, Watch push: Chinese, Japanese, Korean, Latin, Cyrillic; Latin includes: (English, French, Spanish, language: Portuguese, German, Dutch, Vietnamese, Northern Europe, Central Europe, size: 1.91 “square screen resolution: 286 * 340 (sRGB high color gamut) type: IPS LCD Bluetooth: Bluetooth 5.3 weight: Head: 33.2g Complete machine: 51.5g colour: Vermilion color, gold other: Operation: full touch Battery: Polymer lithium ion battery Battery capacity: 3.7V /200 mAh Charging mode: Magnetic suction charging wire Charging time: About 2 hours Highlights Personal Health care Smart Notification Reminder 50+ sports modes Blood Glucose Voice Assistant Spec: Main machine: 43.86 * 38.16mm (excluding key size) Recommended maximum size of protective mold: 39.6 * 34mm, fillet 9mm thickness: 10.8mm (excluding heart rate position) Complete machine: 278 * 39.67mm (including maximum size of watch strap)