This item was received from someone else. It is unused. It was unopened, but I opened it for the photos. I have not tested the operation. It generates up to 8.5 billion bubbles per second, providing a comfortable shower experience. You can switch between straight mode and nano-bubble mode depending on your needs. It adheres to pores and washes them away; there's no need to scrub. It can remove foundation in just 10 seconds. Bubbles smaller than pores (minimum diameter 0.000005mm) remove dirt from pores. Ultra-fine bubbles gently wash away dirt while preventing hot water and moisturizing your skin. By using fine ACF carbon fiber, it removes 99% of residual chlorine.