TOTAL FRAUD COMPANY THE BOX THEY SELL IS NOTTT NASA TESTED U L LISTED C SA APPROVED NOT ROHS CERTIFIED THE UNIT DOES NOT PROTECT YOUR HOUSE FROM ANY POWER SURGES THE UNIT IS A CHINESE PRODUCT SELLING ON LINE FOR $21.00 BUT EVEN AT $21.00 ITS STILL NOT ANY GOOD . THERE ARE MANY OF THESE PRODUCTS MADE IN THE UNITED STATES THAT HAVE DONE THE WORK TO DESIGN A UNIT THAT WORKS AND IS UL APPROVED ALWAYS ASK TO SEE THE UL APPROVAL . THESE PEOPLE SHOULD BE PUT OUT OF BUISNESS . THEY ALSO CLAIM TO BE ON ABC CBS NEWS FOX NEWS NBC THEY HAVE NOT BEEN ON ANY OF THOSE SHOWS BUYER BEWARE