Dyson AM04 Hot & Cool Table Fan (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 6-month warranty The Dyson Hot + Cool fan heater uses an efficient motor and Air Multiplier technology to project heat throughout the room Air Multiplier technology creates an uninterrupted stream of smooth air If tipped over the Dyson Hot + Cool fan heater automatically cuts out And there are no fast spinning blades or visible heating elements, so theres no need for a safety grille