Real-time heart rate testing: Monitor your real-time heart rate, help you know about your heart rate when resting and doing sports. (Before testing heart rate, you should tighten strap, and wait 8s, then you can normally use it)
Sleep monitoring: Monitoring sleep quality, tell you deep sleep time and shallow sleep time.
Sports tracking: Record your sports data, let you know steps taken, calories burned and distance traveled.
Call / Message Reminding: Your smart phone's assistant, when calls / messages come, K18 will tell you. (iOS system don't support this function)