The 100 watt, 120 Volt Under the Desk Space Heater, plugs into a standard outlet. Comes with Ezymount Stands - no drilling holes; a 6ft power cord included; installs in less than 5 minutes with no tools. It uses the principle of heat convection, the hot air rises and gets displaced by cooler air. The Amaze-heaters do not have built-in fan; therefore, there is no noise and no stirred-up dust; this eliminates airborne dust problem and is ideal for people suffering from asthma or allergy issues. Comes with Heat Reflector to minimize heat loss into back support surface.