1.The cotton tube must be moistened to absorb moisture. Working for a long time will burn the circuit board. It is best to work for 2 hours and rest for 2 hours.Step 1: Open the front cover of the humidifiers, and rinse the cotton tube until the whole tube is wet. Step 2: Fill the humidifier with half a bottle of water, and then screw on the front cover. Step 3: Insert the USB cable into the socket, press the switch, and the humidifiers starts to work.2.[A humidifier is needed in a dry environment]:Please use clean tap water and do not add powdery oily debris that can clog the filter into the bottle. In a dry environment, you will feel dry and peeling skin, dry and tired glasses, dry nose easily, and poor sleep quality.This is a cold mist aroma diffuser that can add essential oils, at home or in the car, you should be equipped with a cheap and reliable humidifier to keep you away from dryness.3.[USB Power]: Through the connection of the USB power cord, you can use the power port of the computer or mobile phone, or plug it into the USB port of the car to humidify the air inside the car and prevent the nose and throat from drying out.4.[Low noise design]:The silent control of the mini ultrasonic humidifier can create a comfortable and interference-free sleeping or working environment, suitable for baby rooms, cars and offices. Atmosphere 7 colored warm lights add to the quiet night.