Godeeptech 100ml Spa Soft Air Mist Humidifier Silent Aroma Diffuser Create instant relaxing aromatherapy by adding essential oils Whisper-quiet ultrasonic operation, Advanced ultrasonic diffusing technology with auto-shut off when water level is low Timer settings: 180 minutes, 120 minutes, 60 minutes and 30 minutes. 8 soothing color lights to choose Provides moisture for Dry Cough, Sinus Irritation, Dry Skin High vibration frequency: 2.4 Mhz, High capacity water tank: 100ml, Perfect for room up to 220 sq. ft.