I chose this product to monitor, on a daily basis, my physical activity and record my sessions rower rowing Care and other sporting activities (biking, jogging, walking). I already had the H7 belt connected to my iPhone. I watched the price of the watch cardio / M400 GPS for control in addition to my belt and have ordered at 151,22. A few days later, I received a few days under version M400 + H7 belt (it was Christmas). Very happy with the product, easy to adjust via polar flow. I did my data synchronization via my iphone and bluetooth phone then synchronizes itself with the site 3G or Wifi. So I would not need to connect the watch to its USB cable for recharging. GPS functions not tested I love the message it's time to move on the screen that appears when you are inactive for too long. I recommend.