3 heat settings: 600W, 900W, and 1500W. Safe heat conductive oil used for heat transfer. Adjustable thermostat. Convenient carrying handles. 7 over-sized oil fins. These allow for better heat distribution. Tip-over switch. Built in to the unit, this pendulum style switch disengages the heater should it be accidentally knocked over, Heavy duty casters. Provides easy maneuverability. Cord wrap and plug storage.