Water Flossing Cleans Effectively for a Healthier Mouth: COSLUS C20 water flosser boasts advanced, safe, and effective 0.3mm+0.3mm ultra-fine dual-thread water pulse technology, developed and continually optimized by our research team over years of research and real user testing. This water dental pick delivers ​​1400-1800 high-pressure pulses per minute​​ to ​​target and dislodge​​ plaque for a thorough clean. This water flosser also features multiple operation modes and multiple pressure settings to suit different oral conditions and users BPA Free Upgraded 300ml Extra-Large Water Tank, No Need for Frequent Refills: COSLUS C20 water flosser features an upgraded 300ml water tank, twice the capacity of other old models, eliminating the need for frequent refills and making your oral cleaning more convenient and efficient 30 Days Super Long Battery Life, Portable Use Anywhere: COSLUS C20 water flosser boasts double the battery life of others with a powerful rechargeable battery and battery indicator. Just charge for 3 hours and enjoy 30 days of use. It's compact and lightweight, perfect for home and travel use. This water dental pick comes with a USB cable making it an ideal travel kit. Benefit from an exceptionally long 30-day battery life, making it a truly portable solution for your convenience IPX7 Waterproof and 3-Year Durability: COSLUS C20 wireless water dental pick boasts superior waterproofing, allowing easy cleaning and safe use during showers. Its upgraded motor delivers a more effective dual-stream water flow and is built to last for 3 years under typical use Easy to Use and Gentle Safe: Through the dedicated research and iterative practical validation by our development team, COSLUS C20 water flosser provides multiple operation modes and pressure settings, with three convenient modes to suit the needs of different age groups, while ensuring optimal performance and longevity. Its ergonomic handle and five interchangeable tips ensure a comfortable and versatile experience Note: a, Adapter is not included to avoid wasting resources, but you can charge it using any 5V adapter on hand. If needed, get from COSLUS. b, For first-time use, set to 'Soft' mode and keep your mouth closed to let your gums gradually adapt to the water pressure. c, Packaging may vary (new or old), but the contents are exactly the same.