Defective. Quality control is obviously lacking for this Made in Mexico Eureka Mighty Might product. Plugged it in, it ran without pushing the on/off button. But, the on/off switch mechanism must not have been installed so there is no way to turn the vacuum off or back on. Unfortunately I had not opened the box to inspect until after the Amazon 30 day return policy expired.  So I called Eureka Customer Service. They were helpful, and referred me to their local service provider to either repair or replace.  Word to the wise, inspect all merchandise from Amazon before the 30 day return policy expires!!!!