Two Mist Modes and Lighting ModesThe portable mini humidifier has two mist modes. Press the button once for continuous spraying for 10 hours, press the button twice for intermittent spraying for 16 hours (stop for 2 seconds). Press the button for the first time to turn on the LED night light; press the button again to switch the LED night light to breathing light. You can choose the mode according to your needs. Very easy to use and ideal for moisturizing dry air for a long time. Ultrasonic quiet operation and best choice- Humidify your living space to prevent dry air and stuffy and flu/cold germs from infecting your loved ones. The quiet humidifier purifier provides fresh, clean air, moisturizes dry skin and improves dry, peeling skin. Air Humidifier Diffuser with Water Reservoir with a capacity of 500ml, working time up to 10-16 hours. The cool mist humidifier can only be powered by the USB cable. There is no AC adapter in the box. Including USB data cable, interface for computer, laptop, power bank. When the water level in the tank is lower than the water level sensor in the tank, all spray modes will be automatically deactivated. Prevent dry burning and ensure your safety. Important TipsDo not use essential oils, perfumes, distilled water, they will clog the cottons- rods and render the humidifier unusable. If the humidifier can't spray water for the first time, please refill the water and return it after 5 minutes, so that it can absorb enough water faster or soak the cotton.