Krabman
The five volt power supply provides all the power to the monitor. You can adjust the brightness at the display, as I said, to four levels. There is no other power source required. The readout(monitor) is very attractive, but it does sit at a slight angle, downhill, from left to right. No other fit or finish problem. I just really like the lack of time delay and interpolation of the numbers displayed. You don't have to stare at the thing to figure out what it says.
Ron