Newly upgraded water tank: The improved fully removable water tank allows you to thoroughly clean lime and bacteria inside, which is impossible for common oral irrigators. Dual waterproof design: IPX7 waterproof design is adopted both internally and externally to provide double protection. The intelligent design prevents leaks and allows the dental floss to be safely used for showering in the bathroom. Long-lasting battery and USB interface charging: The rechargeable oral irrigator with a powerful lithium battery can be used continuously for 7-10 days once fully charged. The USB interface charging design is applicable to a variety of charging devices, making charging more convenient. 3 modes and rotating nozzle design: Normal, soft, and pulse modes to meet various oral care needs. The 360° rotating nozzle design allows you to easily clean hard-to-reach areas and prevent dental caries, dental plaque, dental calculus, gum bleeding, and dental hypersensitivity.