Cool Mist Ultrasonic Humidifier QuietCare for Home, Office, Bedroom (4.0L) Humidifier Provides Moisture for Dry Skin, Dry Cough, Sinus Irritation; Relief from Cough, Cold and Flu Symptoms; Feature NO1: Cool Mist and Whisper-quiet; Feature NO2: Spraying Volume Adjustable, Empty Alert Indicator and Auto Shut-off; Feature NO3: Built-in Plug as power supply; Feature NO4: Suitable for rooms up to 430 square feet in size