The technology of is here today - now available to non-engineers! Fuel Cell contains complete, easy-to-follow illustrated instructions for building multiple types of exchange membrane (PEM) fuel cells, as well as templates for 6 PEM fuel cell types, including convection fuel cells and oxygen-hydrogen fuel cells. Monolithic and stack. Two different low-tech fuel cell construction methods are covered: one requiring a bandsaw and drill , and the other requiring only a few hand tools. Anyone with minimal skills and tools be to produce high-quality fuel cells from readily available materials - contact information for material suppliers is included. Electrochemical device, no pollution, no hazardous emissions Exquisite workmanship, compact size, portable and easy to use Colour:Photo Color Material:Plastic Package Contents: 2x PEM Hydrogen Fuel Cell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.