The HoMedics TotalComfort Portable Ultrasonic Humidifier is a new, USB-rechargeable unit that can be used in any room to improve indoor air quality. With a tank capacity of 8.5 oz, it can provide moisture for up to 12 hours. The humidifier has two speeds and uses an ultrasonic method to humidify the air. It is compact and can be easily moved around, making it ideal for travel or personal use. The manufacturer warranty is for one year.