Mini humidifier lowers the noise level for quiet humidification. So it wont disturbing your bedtime, working or study. New ultrasonic technology supports an extremely quiet working noise <30 dB. CONVENIENT TOP-FILL DESIGN- One-piece & top-fill opening design make the humidifier easier to refill the water and clean. No need to remove the water tank anymore, just twist the cover down and directly add water through the large opening top. 2 MIST LEVEL- Sensitive touch button helps you easily change the working modes of the humidifier. There are modes to choose: the continuous spraying mode and the intermittent spraying mode. TIMING SHUTDOWN FEATURE- Humidifier automatically shut-off when the water level is low. 4 hours turning off automatically for the continuous spraying mode. 6hours turning off automatically for the intermittent spraying mode. PACKAGE INCLUDED: 1x Humidifier, 1x USB, 1x Replace Fliter 300ml Portable USB Cool Humidifier This mini humidifier works in whisper-quite operation and add cool mist to the air. Small and easy to operate, it can be easily plugged into the USB interface. Moreover, its auto shut-off function will ensure you a sound and safe sleep overnight. Features USB Powered with Cable Colorful Night Light Two Mist Output Levels Noise-free Operation Auto Shut-off One-button Control Our Tips: Before connecting a power source, please add tap water into the tank, and soak the swab (cotton stick) fully It is recommended to change the Filter Stick every three months Do not add essential oils