SMART & EFFECTIVE. Regulate the humidity level of your room or office with HuPro PRO-771 cool and warm mist humidifier. It features three levels of humidification (Hi/Med./Low) with an adjustable humidistat from 30% to 85%. The auto shut-off feature will come in handy when the reservoir gets waterless, you take the tank off, or the set period of time is over. The 6L water tank is great for big rooms up to 500 sq.ft. Sustain the desired air humidity level to stay healthy without extra effort.