Featuring an operating time of up to 16 hours with a tank capacity of 4L, this ultrasonic cool mist air humidifier will last the whole night. The ultra-silent operation, automatic switch-off function, and the energy-efficient quality of the air humidifier makes it the perfect addition to add to your home or office for plenty of easy-breathing days. Attention: Read the user manual carefully before operation. Do not use hot water. Do not add fragrance or oil in the water as it will cause malfunction. To protect against electric shock, do not immerse the base in water.