Granted, can not be really easy to attach to the bicycle, the device, to interfere with the smooth acreage. With a little tinkering I still fastened it on the down tube, where it can be easily turned on and off even when driving. Among the features I can only say: it works for me. I tested it with both an HTC One and a mini S4 from Samsung. From about 10 km / h device delivers enough power so that the mobile phone can be operated with constant GPS, 3G and bright display without discharge. This speed you drive almost always, unless one is at the traffic lights. If I run the unit more often in city traffic, I'll possibly still interpose myself a buffer battery. For cycling, it is, however, without limitations. Conclusion: 5 stars for the function, a star deduction for tricky assembly
