I have now tried the belt at four different devices, two laptops, two mobile phones of newer design, Sony Ericcson and Samsung Galaxy 3, both with Android> 4.0, all has not helped. As such, the device is completely incompatible with everything except one has perhaps an iPhone, where there lies the point? Therefore, the two Steren come only because Verarbietung and packaging and the possibility concluded that it could work with a EiPhone now but, sad ...