This charging method is very convenient because it does not need to remove the protections of the USB connector (tested for several months). I used me for a tablet and a Z2 xperia Xperia Z Ultra phone. I bought the Sony docking station for the tablet (very very expensive for what it is) and I regret because the magnector is much more convenient (you can even recharge with a protective cover which is not the case to the docking station). I was afraid that we can get the wrong direction by plugging it appears that this only works if it's the right way. A very good value for money.