to make dogs work according to their hunting level. i have now problem with them, but your customers on the other end of the phone might. it can be powered by a standard us outlet. go with the flow rather than be upset. i have talked to a lot of people about my issue and most people don’t believe it is anything serious. does your little one put up a fight every time you try to trim their nails? how do i measure for fabric vertical blinds? get your laughs and move on folks. 