System requirements: Android 4.4 and above, I0S 8.0 and above, supporting Bluetooth 5.0 Bluetooth version: BLE 5.0 Bluetooth chip: Ruiyu RTL8762C Heart rate chip: Viking Source VC31 Band memory: 128M bit flash, 160k byte RAM Screen display: 1.28-inch IPS color screen Battery capacity: 200MAH Standby time: 20-25 days Working time: about 7 days Physical buttons: full touch screen with buttons Built in motor, vibration reminder Charging interface: magnetic charging dock Waterproof grade: IP68 Sensor: Gravity sensor STK8321 Functional parameters 24 exercise modes, heart rate monitoring, blood pressure monitoring, blood oxygen monitoring pedometer, Display of time and date, step count, calories, and distance on screen basic function Sleep monitoring rules (sleep time, sleep quality) Standard exercise functions (step counting, distance, calories), GPS trajectory movement Time interface with 6 types of UI dial display+massive dial+self-defined dial, mechanical movement Style themed UI, 7 message storage views Call reminder, SMS, QQ, WeChat, DingTalk, Wangxin, Sina Weibo, Instagram, Linkeln, Snapchat, Tumblr, Facebook, Skype, Witter, WhatsApp, Line, KakaoTalk message content push Reminder function give , stopwatch, search for phone, hold up high screen, long sitting reminder, alarm clock reminder (5), Reminder for drinking water, medication, shaking to take a photo, female physiological reminder WeChat sports access, setting sports goals, and sharing fitness information Featured features Weather, smart alarm clock, raise the screen, light up time, search for phone, search for hand Ring, call rejection, shake to take a photo, do not disturb mode (do not disturb time setting, off Ring vibration, turn off message reminders) Tefiti SUOTA function, upgrading the wristband firmware through APK/APP to automatically synchronize data to APK/APP, history query, APP help: general problem resolution