Basic parameters Bracelet sizemmL*W*H=36.6*43*9.3 weight46g Major functionExercise recording (step counting, distance, calorie calculation), exercise mode, message push, information storage, heart rate monitoring, sleep monitoring, blood pressure measurement, blood oxygen saturation measurement, stopwatch, camera control, music control, full font language, 1.4 inches Color screen touch display. Hardware parameter Chip makerNRF chipNRF52832 QFAA APPDa Fit Compatible systemAndroid5.1 (contain), IOS8.0 contain) above FLASH memoryRAM64KB ROM32Mb TypeTFT screen size1.4 inches Pixels240RGB*240 Touch typeFull screen touch Connection parameters BTBT4.2 WIFINO NFCNO Sensor G-SensorBosch 421 GyroscopeNO heart rateTianyi Hexin HRS3300 GPSNO Battery Battery typeLithium polymer capacity170mAh Charging modeCharging clip APP software features Da Fit Step count, sleep, heart rate, blood pressure, oxygen saturation, exercise data recordDial selection, message push, daily alarm clock, photo control, weather informationFind bracelet, time format, do not disturb mode time, all-day heart rate test, turn the wrist bright screen Other parameters Waterproof LevelIP67 Charging timeAbout 2.5H Life time5-7 days of use, 25 days of standby Wristband size:Total length 255MM, adjustable length 155-235MM Body: Plastic + Aluminum Alloy Wristband: Silicone + Stainless Steel List: Watch*1 Data line*1 Manual *1 Packing box*1