This electric heater owns 3 Modes Setting and 3s Fast Heat. No need to preheat, TRUSTECH room heater can quickly warm up the air around you within only 3 sec; With 3-Mode Setting, you can choose 750W Low Heat, 1500W Hot Heat, or Natural Wind as you like so it can meet your demands in winter and summer; The electric heater with thermostat will automatically keep the temperature constant, so no need to worry about overheating issues; With the 90°adjustable design, you can adjust the angle of the heater electric as you like while using this compact heater; Simplicity is preferred, without complicated operations, this electric heater is super easy to use; Just plug it in, turn two knobs at the same time (one for mode choice, one for overheat protection), then hot/cold wind will be coming