The only Humidifier you will ever need! 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 for up to 14 nights (or 120 hours) on one refill.The HF707-S (Silver) is an ideal ultrasonic humidifier for homes, apartments, offices and anywhere there is low humidity. Ultrasonic water vapour is highly beneficial to individuals. Their biggest advantage is high performance combined with low energy consumption.