Each of these four cool mist humidifiers from Pure Enrichment are ideal to moisturize the dry air in your home or office in minutes. All four of these humidifiers are aesthetically pleasing use ultrasonic technology and are packed with smart features that make them the perfect solution for improving the air quality in any room. The Mist Aire Studio is compact and features a 0.7-liter water tank making it great for small areas and travel. It has high and low mist settings which can be adjusted to achieve the desired level of humidity. Mist Aire and Mist Aire Silver provide ideal coverage for medium-sized rooms. They each have a 1.5-liter water tank that is easy to fill and provides up to 16 hours of powerful mist output on the high mist setting. They have a 360-degree mist nozzle along with high and low mist settings so you can control the flow of the mist towards the areas that need moisture. The Mist Aire Silver also has sleep-friendly features such as quieter beeps when the unit is turned on/off and a power light that shuts off after 10 seconds. It has both single and dual mist nozzles to customize the flow of mist in the room and a variable mist knob that allows you to adjust the mist output to achieve your ideal comfort level for up to 24 hours. The optional night light gives you the choice between blue green and red to suit your mood.