The SaticShield Power Perfect HD (Heavy Duty) installs at the breaker panel (licensed electrician required). For homes larger than 2500 sq. ft. without solar or concerns about very high 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.