When I bought this item I was a little concerned that the description says this charges a one Move and one Nagivation controller, without specifying that it can charge two Moves. Well, it can, so buy with confidence and charge your Move controllers (or presumably Navigation controllers, but I don't own any) off the mains independent of your PS3.
Only criticism I have is that the charged lights show up even without a corresponding Move controller in place. I guess I would prefer a light for charging and no light for fully charged.