The ever popular Vision Spinner, providing variable voltage by twisting the dial on the bottom, you can choose how weak or how strong you want your liquid to hit. Ranges from 3.2 to 4.8 volts.
Finished in a blue rubbery feel, is truly stylish and sophisticated at the same time.
This is the 1300mah version, the biggest of the three, this beast will get you through the day. I use one of these myself on long journeys.