1. Bluetooth chip: RTL8762C  
2. Heart rate chip: vc31
3. Screen: 1.28 IPS TFT Color screen, 240*240 pixel
4. Battery: 200mAh Polymeter Lithium Battery 
5. Charging way: Maganetic
6. BLuetooth: BLE5.0 
7. Compatible : Android 4.4 and above,iOS 8.0 and above
8. Waterpfoof Level: IP68
9. Functions: 24 exercise mode, heart rate monitoring, blood pressure monitoring, blood oxygen monitoring, step counting, calories, distance,Sleep monitoring, GPS track movement, multiple message storage view, Phone calls reminding, SMS, lnstagram, linkeln, Snapchat, Facebook, Skype, Twitter, WhatsApp, Line, message content delivery,Sedentary reminders, alarm reminders (5), exercise access, exercise goal setting, fitness information sharing,Weather, stopwatch, smart alarm clock, search mobile phone, search bracelet, call reject, shake photo, do not disturb mode.