Want an easy way to increase room humidity? Take a look at the following Vap0rb ultrasonic USB humidifier, it may be able to meet your requirements.
This is an easy-to-use USB-powered ultrasonic humidifier that measures 2 inches in diameter and weights 2.4 oz. As we can see from the images, the USB humidifier is shaped as a tiny doughnut in order that you can easily put it in a cup full of water. Just connect the ultrasonic humidifier with your computer via USB port, the generated ultrasonic waves can create steam safely and noiselessly. Moreover, the USB humidifier features automatic turn-off when water runs out, and you can also set the USB humidifier to run for 3 hours or 6 hours.
The ultrasonic USB humidifier is priced at $14.99 USD. If you’re interested, jump to ThinkGeek for more details. Additionally, if you need other options you might like to check USB portable humidifier and more via “USB humidifier” tag.