Disclosed herein is a chip on board lead package for optical mice and lens cover for the same. This slurry is used in a method of making water-resistant gypsum articles that includes making an emulsion of siloxane and water, then combining the slurry with a dry mixture of stucco, magnesium oxide and Class C fly ash. The interface member can have flow control means, configured to permit exudate from the wound to flow through the flow control means into the volume under the cover, but not in the opposite direction. The cross section of the power supply line may be enlarged, or the resistivity of the constitutional material of the power supply line may be lowered to lower the resistance of the power supply line.