This flosser is equipped with two water tanks, the regular water tank is convenient for traveling and carrying, and the large water tank is no need frequently refill. This water flosser is IPX7 waterproof design, even if you use it in the bathroom or restroom, you don't need to worry about damaging the flosser when it gets wet. Even if you brush your teeth every day,there are still blind spots in your mouth that are difficult to clean,so you need a water dental flosser.In addition the product is equipped with pulse/soft/normal 3 modes and 2 intensities,it can clean the mouth in 360 degrees without any dead angle.After a long time of market feedback and improvement,this product is more suitable for you.