Nanopresso is a portable espresso machine that uses a pumping system to pressurize water against coffee grinds and does not require electricity for operation. With the help of your hands, a maximum of 18 bars (261 PSI) of stable pressure created during extraction for unparalleled coffee. The Nanopresso works best with all varieties of ground coffee. Add the boiling water to its tank before preparing coffee and then pump it manually. Nanopresso’s ergonomic design and shorter length makes it your travel companion of choice.