Great price for a smart watch.
G6 video - https://www.youtube.com/watch?v=YDi9j_-nx_4
G5 review (G6 seems to be too new to have reviews) - https://www.youtube.com/watch?v=_TubJqP_LGY
Heart rate monitor - With an optical heart rate detector, it will record your heartbeat so as to change your bad habits to build a healthy body
PSG - Automatic tracks your sleep time and quality, including deep sleep, light sleep, and awake
Sedentary reminder - Remind you to stand up for a while after keeping long-time of sitting pose, switch an unhealthy lifestyle
Sports record - Track your sports distance, calories burned, time, goal, etc., it will help analysis sports state to improve your plans
Information pushing - Supports Facebook, Twitter, incoming call, SMS, etc.
Large capacity battery - 380mAh polymer lithium battery, longer using time
Android Wear?