Vortex powered energy efficient high speed permanent magnet motor. Corrosion proof grinding chamber of glass filled nylon. Stainless steel swivel impellers reduce jamming. Removable splash guard is easy to clean and to replace. Front mounted reset butto n for easy use. Safe for properly sized septic tanks. Fast and easy installation. Designed to operate on 110 volts to 120 volts 60 Hz. Mounting hardware included. U.L. Listed. 2 YEAR IN-HOME WARRANTY.