But be careful:
On the Internet (also here at Amazon) I have for this device throughout the information 5V, 1000mA found, but in fact it has 5V and 1200 mA (inscription on the USB adapter). Have tried it anyway and it works absolutely great. Then loads just a bit faster than with 1A and should at the very most batteries that are designed for 1A charging current, also be a problem.
Have thus now several long trips with the P970 as Navi behind me and it invites the phone while at a sufficiently fast, even with high screen brightness.
Only downside is that it is not (almost) completely disappears in power supply as intended, but about 1 cm stands out. Is visually but still ok.