1.Night light modePress and hold the button for 2 seconds to turn on the night light mode, and press the button again for 2 seconds to turn off the night light mode.2.TWO MIST MODESThis mini humidifier has two modes. When you press the button first time, it will continuously spray for 4 hours. When you press again and it will intermittently spray (stop 2 seconds) for 8 hours. 3.SAFE & AUTO SHUT-OFFThere is built-in water level sensor inside that will automatically turn off the power when the water is lower than the safe water level. And the seal is strong,no longer afraid of pouring liquid to leak in accidence.4.ONE BUTTON CONTROLThe portable usb humidifier is very easy to operate. One button controls for all functions, you simply need to press one button to set the mist. Portable and small design is very easy take with you anywhere and super perfect for travel,bedroom,office, which is effectively moisturize dry skin and help you reduce skin peeling. Make your life easier!