Shake To kinetic energy is an application launched many months ago in App Store and its developer promises that it can charge iDevices using kinetic energy. The problem is that iPhones have not implemented the hardware that allows charging in such a way, so shaking the terminal, as described by its developer, will only generate fatigue for you. To be honest, this is one of the most innovative tips I've ever seen App Storeof the Apple company and I recommend that you stay away from this application, because it does not do exactly what its developer says.
