ONE BUTTON CONTROLThe portable USB personal humidifier is very easy to use and set up. One button controls all functions, you simply need to fill it with water and click the power button 1s and a beautiful stream of mist rises from it. QUIET ULTRASONIC OPERATIONUltrasonic humidifiers produce a near-silent (Quieter than a library) ensuring ultra-quiet operation. This air humidifier won't bother you while sleeping and working. Utilizing ultrasonic waves to produce many delicate sprays of liquid water increases air humidity and effectively improves life quality. PORTABLE MINI HUMIDIFIER USB POWER SUPPLYPortable small design is very easy for you to take to anywhere. The USB Power Supply is compatible with any device USB port which ensures the small humidifier can be used in the bedroom, office, car, etc. 7 LED LIGHTS NIGHT LIGHTThis mini humidifier has 7 LED colour lights Cycling setting that enhances the room's atmosphere while delivering a soothing cool mist. Great night light for kids who scared of the dark at bedtime and puts moisture in their room so they don't wake up stuffy in the mornings. NOTE- Do not use essential oils,perfume, distilled water, which will cause the cotton swab to clog and the Humidifier to be unusable. Please make sure the cotton core has soaked a few minutes before you turning it on. Any quality problem, please do feel free to email us.