The Osmio Duo Hydrogen Water Bottle uses the latest technology Proton Exchange Membrane (PEM) as well as the leading method of Solid Polymer Electrolysis (SPE) technology to add hydrogen to the water and the air in the bottle. The Osmio Duo Hydrogen Water Bottle 400ml is a dual hydrogen water product that can be used for both enriching the water with hydrogen and for breathing hydrogen gas. The product comes complete with UK Plug and USB Charging kit, and the nasal cannula kit. It also comes with additional accessories designed to enable you to attach a standard sized off the shelf PET plastic water bottle to the base so you can use the water in an alternative bottle to generate the hydrogen. The Osmio Duo only puts, and can only ever put pure Hydrogen H2 gas into the water. Oxygen is separated out. This means any kind of water can be used (i.e. tap water, mineral water, spring water, filtered water, osmotic or distilled water). Please note that the quantity of h2 can vary depending on the level of dissolved solids (TDS) in your water, so the purer the water, the higher the levels of hydrogen that can be added.