Smart watch, barely used, & loaded with functions.  This is a smart watch that interfaces with the DA Fit app to manage the watch on your smart phone (Apple or Android).  This watch is loaded with all the usual functions of a smart watch to monitor various physical activities, plus caller ID, make and receive calls, play music from smart phone, etc.  It also has features for monitoring, heart rate, blood oxygen and blood pressure.  (Smart watches are not medical devices, so they should not be relied upon exclusively for monitoring health metrics.)  The watch case is approximately 43mm.  As a low-cost competitor to the high-priced smart watches, this watch offers a pretty amazing number of features.  This watch was used by my wife for less than six months, but found the size awkward for her small arm, so she went back to a 38mm watch.  It is in virtually like-new condition.  It comes with two silicone bands:  white and pink.