An air purifier is provided, including a body comprising a wall defining an interior space, a first opening to the interior space, and a second opening to the interior space. The expanding clamping device includes a clamp base portion, first and second traversing wedge blocks, an actuation screw, and a clamp plate portion. The present invention further permits acquisition of communication links with external test equipment for which exact protocols and port configurations may not be uniquely specified. The one-sided adhesive sheet is formed into an external shape that fits a wiring course shape of the wire harness with respect to the attached body. The separator advantageously has a groove therein approximately positioned over an outer edge of an electrode of the fuel cell to reduce any pressure between the separator and the outer edge of the electrode upon assembly and during use thereafter. Each of the organic EL elements of the stack is activated with a different level of voltage.