Parameters: Chip:ATK8910 Andiord OS:Supports Android 4.4 and above IOS : iOS 10.0 and above Bluetooth-compatible:Dual Bluetooth 5.0 Waterproof Level:IP68(Please do not use it in deep/slat swimming and hot shower) Screen size:1.45-inch full round Screen Resolution:.412*412 Screen type:IPS full viewing angle color screen Battery Type:Lithium Battery Battery capacity:320mAh Charging method:Wireless charge Charging time :About 4 h Manual language (neutral, brand optional):Chinese English APP:Wearpro APP supported languages: Chinese, English, German, Russian, Spanish, Portuguese, French, Japanese, Italian, Polish, Korean, Arabic, Persian, Thai, Vietnamese, Traditional Chinese, Greek, Romanian. Turkish, Hebrew, Czech Watch supported languages: English, Chinese, Traditional Chinese, Danish, Greek, Latin, Romanian, Turkish, Hebrew, Czech, Polish, Spanish, German, Russian, Portuguese, French, Japanese, Italian, Vietnamese, Korean , Arabic, Persian Functions: Breathing training, dial push, stopwatch, brightness adjustment, multi-sport mode, sleep, heart rate, information, remote music, remote photo, weather, mobile phone search (connected to a mobile phone), Bluetooth calling, Bluetooth music playback, password protection, calculator, Split screen display, quick widget, weather, massager, Alipay, my QR code