Not just from a DC adapter or a Dock, you can power the novita GreenFan™ F-2/ GreenFan® F-1 , with an optional rechargeable battery module. A single charge gives you up to 12 hours of continuous usage, keeping you cool wherever you are! Lightweight and portable, GreenFan™ F-2/ GreenFan® F-1 is designed to be adjustable for your needs. Being your standing fan or compact desktop fan, you can bring it to any room in the house and anywhere outdoors!