Two-year warranty 210 ml water tank 2 speeds 4 heads Battery is sufficient for approximately 50 uses of the entire water tank Thrust force from 45 to 75 PSI  The water jet device for cleaning teeth is from Waterpik, the most famous and largest brand in the field of water jet devices The Cordless Plus Rechargeable and Portable Water Flosser offers a new quiet design and is perfect for use in small bathrooms or for travel. Features a narrow, ergonomic hand grip and improved rotation for ease of use. It removes up to 99.9% of plaque from treated areas and is up to 50% more effective for improving gum health than dental floss. Waterpik® is the #1 recommended brand of water flossers, clinically proven and accepted by the American Dental Association (ADA). It comes with two speeds for strong water pressure, in addition to a water on/off button