Chip: NRF52832 / Operating system: RTOS
Heart rate sensor: HRS3300 / G-sensor: BOSCH BMA421 
Screen:1.3 inch TFT, Resolution: 240*240
Battery: Built-in 200mAh lithium battery
Charging way: Magnetic type
Touch way: Touch+ Side key
Waterproof: IP68
Compatible: Android 4.4 or above, iOS 9.0 or above
APP: Da Fit
Function: Activity tracking(step, distance, calories),Sleep monitor,Heart rate monitoring,Blood pressure monitoring,sports  ( walk,running,  cycling,  basketball,swimming, skipping,  football,badminton),Call reminder,Message Reminder: SMS, Facebook, Messenger, Twitter, Instagram, WhatsApp, Linkedin, Skype, Line,Viber, KakaoTalk, Vkontakte, Apple mail, Apple calendar, Facetime,QQ message, Wechat, stopwatch,control musicsuspend,next,previous,crank call display,reject calling,Screen brightness adjustment,Smart clock,find band,Shake band take photo,Hand Raise Light Up,Set up fitness target,Fitness information sharing,Save 3 item message,Synchronizing data to APP/APK,Apple Health,Do not disturb mode,long sitting reminder. /  Other phone App notifications(only Android).