The SaticShield Power Perfect SD (Super Duty) installs at the breaker panel (licensed electrician required). For homes larger than 2500 sq. ft. with solar, with a smart meter or with concerns about excessive levels of EMI and EMF. Features & Benefits: Surge protection, line conditioning, EMF reduction, voltage regulation, negative harmonics reduction, reduced electrical consumption, equipment longevity, energy savings. Ratings: 240 V, 15 A, 3600 W, 50/60 Hz.