The Presso is a manually operated espresso machine — no electricity is required. You make an espresso by adding hot water and ground coffee at the top. When you press down on the levers, the pressure pushes the water through the coffee, and it is deposited in your cup. You can make either a double espresso or two single espressos at one time.
Update: See also this new non-electric espresso maker.
These would go well with the hand crank coffee grinders we featured not long ago.