If you have a computerized sewing machine you need a surge protector that not only protects against surges but also low voltage. Low voltage can also be harful to machines. I found one at Staples. You have to look on the box to see if protects against both. The sales person didn't know and told me they didn't have any. I can't remember the price, but it was well under $100.00. If your machine is worth much, that isn't too much to pay to protect it.