?Innovative Retractable Stainless Steel Water Hose? Unlike other silicone hoses, inconvenient to clean, and be easy to smell and become dirty after using for a period of time. YaFex water picks adopt 304 food-grade stainless steel retractable water hose, it is easy to clean, and be more hygienic.(NOTE: please use water to flossing again after you used the saltwater or mouthwash.). ?20-30 Days Ultra-Long Continuous Use?This rechargeable water flosser with a increased capacity rechargeable battery, will last 20-30 days use after full charged in 4 hours. Come with USB cable (Adapter Not Included), applicable to a variety of charging equipments (Output: 5V 1A). (The charger is not included). ?Collapsible Portable Design for Travel?The folded size is similar to a phone. Fit easily in bags or luggage even pocket. Come with a protective travel case, keep your oral irrigator and jet tips clean and tidy. Perfect for using at office, gym, home or traveling on business and vacations. ?Upgraded DIY Mode, Customize Work Pressure?Based on the 4-mode (DIY, Normal, Soft and Pulse), this cordless dental flosser added adjustable DIY mode, which means you can customize your own mode (40PSI -120PSI). Suitable for everyone to find a comfortable water pressure, Perfect for sensitive teeth, kids, and elders. ?Professional Power Water Flosser with Case?This water picks teeth cleaner with up to 1600 times/minute high-pressure water pulse, strong enough to remove 99.99% food residue hidden deep between teeth and below the gums where the traditional brushing can't reach.