Our small Gaby USB Powered diffuser is perfect for taking on the go. Simply plug it into any standard USB source or feel free to use an adapter block (similar to your cell phones charger) to power it with a wall socket. It runs constantly on one fill of water for roughly 4 hours straight. You have the choice of running this with a color changing LED glow or diffuser with no lights. It is extremely easy to fill with water and its motor is silent. Great for any small space.