Product Details Permanent filter for white dust, mould & bacteria Negative ions for purified air & restful sleep Cool or warm mist from one machine Automatic humidity control, timer & shut off Save money. No wicks or filters to replace Product Description The HF 707 Digital Ultrasonic Humidifier can help make the dry winter months more liveable. Its high-frequency vibration technology creates a micro-fine mist that immediately evaporates into the room creating a comfortable living and sleeping environment. This compact, ergonomic and virtually silent ultrasonic humidifier is loaded with features normally found in more expensive machines. The HF 707 features a permanent, rechargeable, nano-silver and ceramic combination filter that controls white dust, bacteria and mold. Other advances such as its ability to produce either warm or cool spray mist, or its capacity to generate healthy negative ions, sets the HF 707 in a class by itself. Its easy-set, push button controls, and its built-in hygrostat that automatically adjusts mist output to the desired humidity level, make the machine very easy-to-operate. Its large 1.6 gallon (6L) tank, and variable mist control, can humidify large or small rooms. Drawing only 38 watts of power and not requiring any expensive consumable accessories such as wicks, pads or filters, can save you money over the long run. Advanced technologies, ease-of-use, and low maintenance costs, makes the HF 707 the logical choice for all your humidifying needs. Features and Benefits Efficient and Effective High moisture output can quickly humidify a room up to 40 m (430 ft). Low water indicator notifies you when to refill the tank. Advanced Technology Advanced digital technology can produce either cold or warm mist.