Serene House Corona Through a ceramic resonator, our diffusers use ultrasonic vibrations to turn the fragrant water into mist, dispersing it gracefully into the air. Best of all, it's designed with a built-in timer and automatic shut-off so you can operate it worry- free. Atomization Mode: Ultrasound Continuous Atomization Time: Approx. ≥ 7 hrs Suggested Room Size: 15 - 35m² (161.4 - 376.7sq ft) Water Tank Capacity: 130ml (4.4 fl . oz.) Product Size: L 12.5 cm x W 12.5 cm x H 24.8 cm ( L 4.9 in x W 4.9 in x H 9.75 in )