Using this humidifier is super easy. First, unpack the humidifier from the box. You'll find a humidifier, a USB cable, instructions, and a cotton swab. Plug the USB cable into a power source and the other end into the humidifier. Then, open the water tank and fill it with water. Make sure not to overfill it as the capacity is 1 liter or less. Once it's filled, close the tank. Turn on the humidifier, and it will start to release a fine mist. It doesn't have a timing function, so you can keep it on as long as you need. The battery can last up to 6 hours, so you don't have to worry about it running out of power quickly. As for maintenance, use the cotton swab to clean the fog outlet regularly to prevent blockage. Also, if there's a water shortage or power failure, don't worry as the humidifier is protected. Just refill the water or restore the power, and it will work again. Enjoy the benefits of improved air quality with this great little humidifier!