After a few weeks of use, the light sensor and the touch screen are blocked. Furious I spoke to customer service and a few emails everything was settled. I received the description of manipulations to do to access hidden menus that have reset the beast. This is not something to wear to permanently wrist, better keep it in your pocket and do not expose to shock or moisture. The app that goes with it is complete and it's even better with a balance connected to monitor all data and control objectives.