Used Pro-port SH-Z10W Square Ultrasonic Humidifier Operation confirmed - Tank capacity: 3.7L - Humidification volume: Approximately 330ml/H - Operation method: Dial type Because it is an ultrasonic type, humidification starts immediately when the power is turned on. The tank capacity is 3.7L, allowing for approximately 10 hours of continuous humidification. . It supports approximately 9 tatami mats (pre-fab Western-style room) and approximately 5 tatami mats (wooden Japanese-style room). The dial switch allows for ON/OFF power control and stepless adjustment of the humidification volume. Thank you for viewing.