I use a DT-901 since I bought a Lumia 930. The shop is as fast as USB. I'm very excited, because it has now searching for the charger and the "wiring" does. Therefore, I have my wife directly concerned a charge cover for your Lumia 820. She thinks it's also great that they now just have your smartphone is set to load on the pillow - so excited that we now have the same even bought a second ....