The ADDvox Portable Personal Humidifier uses whisper quiet ultrasonic technology to produce a room temperature, superfine mist you can direct where you want. You breathe easier and feel better. Variable mist settings range from low to maximum, moistening just the air around the unit or moistening the air in the entire room. Works with distilled water, non-carbonated unflavored bottled water, or plain tap water. One 16 oz. water bottle lasts up to 12 hours on low setting. Heat and air conditioning can make homes, offices and hotel rooms dry and unhealthy. This can cause dry skin and hair, aggravate respiratory conditions and cause general discomfort. With this ADDvox compact humidifier on your desk, counter, or night stand, you'll have complete control over the atmosphere immediately around you. The built-in LED lamp also functions as a night light. The mist function automatically turns off when water runs out. The ADDvox Bottled Water Personal Humidifier measures approximately 2-1/2" W x 4-1/4" D x 4-3/4" H and weighs less than 1 lb., so you can take it wherever you go. AC Adapter plugs into any standard 110-120 volt U.S. AC power outlet. Travel bag, bottle adapter, and cleaning brush included (water bottle not included).