Very weird happened to me, in fact I feel I have received the device returned by J Theodet (see commentary). what happened, the Bluetooth connection worked once ... it was perfect, fast and seemed reliable (compared to medical device), in short excellent, over the finish of the object is beautiful, I ' was very happy with my new acquisition ... then the blue light went on and never change status. Clearly the unit has been unusable. Customer service has tried to bring me a solution but remained ineffective. Disappointed, I returned the device from Amazon which as always delivers a flawless service. I ordered this article reconditioned. It is possible that this is just a bad luck stroke. Having balance Withings Smart Body Analyzer Scale which gives full satisfaction to the whole family, it's hard to decide to test again with this unit, a pity because Withings makes beautiful objects and mobile is constant improvement.