Good size for my small wrist. The charging connection is a little finicky as the magnet is not strong, but doesn't take long to charge. Connects easy enough to my Huawei phone. Exercise auto-detect does not seem to sense random exercise. I use the outdoor cycle mode and it speaks to you every 1km. Not sure of the GPS accuracy as Google says my cycle ride to work should be 4.7km and the watch measures 4.5km. I still find it handy, however. The heart rate seems fine. Oxygen saturation seems okay but sometimes says my level drops below 90%, which is when I am sleeping. Sleep monitoring is interesting. Using the watch to answer the phone is handy...view more