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This is an overview of how to write technical descriptions from an online technical writing handbook:
http://www.io.com/~hcexres/textbook/desc.html
The site provides links to four sample descriptions. We recommend one in particular as being similar in organization and level of detail to the description they’re writing, the Rayovac Flashlight:
http://www.io.com/~hcexres/textbook/descx1.html