This portable USB air humidifier is pretty cool. I love that i can have a diffuser in my car and use my essential oils with it. It plugs into a usb port, which i have connected to my cigarette lighter. I also like knowing the air in my car is a little cleaner- especially because i smoke. Anyone that gets is my car sees this and mentions how cool it looks and how good it smells. Especially if you smoke, I would recommend getting one of these.