-5L HUMIDIFIER for LARGE ROOMS: This ultrasonic cool mist humidifier with a mist output of up to 250ml/hr, can operate in rooms up to 377 sq. ft. -LONG-LASTING MIST: With two 360-degree rotatable nozzles, this cool mist humidifier operates for up to 50 hours in low mode. You can adjust the volume of the mist output to your preferred humidity level for comfort and health by turning the dial. -AUTO SHUT-OFF: The MOOKA ultrasonic humidifier will automatically turn off when it runs out of water or when the water tank is lifted up. WHISPER-QUIET: During operation, this air humidifier produces less than 28dB of noise, for subtle humidification of rooms without disturbing your study, work or sleep.