The SaticShield Power Perfect SD (Super Duty) installs at the breaker panel (licensed electrician required). For homes larger than 2500 sq. ft. 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.