I have
theseI have one attached to my cigarette lighter outlet in the cab of the clipper - I plug my GPS into one of the 12v plugs, my seat warmer into the heavy duty 12v plug, and my cell phone and mp3 players into the usb plugs.
I also have one in the house part connected to a 12v outlet by the battery so I can plug in laptop, cell phone, tablet, etc.
Then I removed a wall light and installed
this in its place. There wasn't enough depth in the wall for a flush setup. This is placed up high so I can plug in my cell phone, kindle and tablet at night and be able to reach them while in the cabover bed.