I was happy, everything was fine. But then yesterday ... failure of the craft. After much tinkering and testing, I managed to unlock it: it works again for now ... But in parallel, I called Amazon customer service. Always nice and helpful, 30 days having elapsed return they give me contact details by email or speak to Withings. What I did. Message return Withings: we noted, but we are overwhelmed, it may be long ... I just cancel my request to them, but also I bought them online (voucher cause) suitable strap ...: CB charged April 26 message of apology (in English) 2 May to apologize for the delay in delivery shipping from 1 week to 10 days. I still have not received anything by cons .... they give me a discount code for your next purchase ... Both say that I did not take advantage ... I wanted the connected platform, I will do without.