This humidifier has a 500ML water tank, Small but powerful humidifiers quietly working for better cool . With instant refill and easy to clean. The best partner to enjoy healthier when traveling, bedroom, office, baby room and car with USB power supply. The portable humidifier is very easy to operate. One button control all functions. You just need to press the power button to control the mist. This mini humidifier has two mist modes: Continuous and intermittent mode. This subwoofer humidifier operates with almost no sound. It will not disturb you when you sleep or work, it can effectively moisturize dry skin and help you reduce skin peeling. It is an ideal gift for children, friends, couples and so on.