Very easy installation - Apply wide overlapping strips of masking tape to the steel base plate and mark the centers with a cross. Remove the tape and use it as a template. Locate the 4 screws that barely go through the center of the "x" holes. Using the template, screw in the 4 screws in the middle of the "x" marks on the band. Align the 4 screws on the metal back panel and use both hands to press the extension onto the 4 screws. It will snap and stay there. "Metal Oxide Varistors (MOVs) absorb excess electricity" protect your electronic equipment during power line surges or surges. If the overvoltage is large enough, the metal oxide varistors will explode and your electronic equipment will be saved. Replacement MOVs are easy to find on eBay or electronics vendor websites. Why not just use a resettable circuit breaker? Because they don't shut down the line fast enough and your equipment will burn if it shuts down. Heavy-duty parts like switches and sockets feel solid. The body is all metal. It also has a long thick power cord.
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