Wired & wireless internet are the same the world 'round. However Germany, like all of Europe, uses 220V/50hz power instead of the 120V/60hz here in the US. Plug standards are different as well. Most modern laptop power bricks are designed to run on both US and European power standards, so all you need it a set of Euro plug adapters. The key is to read the fine print on the laptop power brick. If it says input voltage of 120V to 220V, you're good to go as long as you have the proper plug adapter.
It is one of the blessings of old friends that you can afford to be stupid with them. Ralph Waldo Emerson.