Breathe in comfort wherever you go. Compact enough to fit in your car's cup holder, it's perfect for personal spaces at home, in the office, or on the road. The easy-to-fill 7.7 oz. water tank provides up to 7 hours of runtime when plugged in, with automatic shutoff after 12 hours for added peace of mind. Use the rechargeable option for up to 2 hours of cordless operation. A built-in color-changing accent light lets you customize your ambience.