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Holmes filter free warm mist humidifier, model HM5305. This unit has an on/off switch and can be adjusted from Lo to Hi. It has an automatic shut-off feature that will activate when the water is empty and the water in the heating chamber is almost empty. It also has a humidistat feature that allows you to set and maintain the humidity level you want for your room. The humidistat is designed to operate between 25% and 65% relative humidity range. It comes with the Owners Guide.