Excellent After-sales Service: nearly 10 years of production experience, 12 months of guaranteed replacement.(Nicefeel VIP members can extend warranty to up to 18 months). Large Water Tank and IPX7 Waterproof: 300 ml large water tank makes you refuse the trouble of repeatedly adding water. IPX7 waterproof, not afraid of any wet environment. High Capacity Battery, Smart Timer and Memory Function: 1400mAh Lithium battery, 30 days on a full charge.(2 minutes twice a day) Charging with USB interface, can be suitable for various occasions, such as car charger, power bank, computer. 2 minutes timing function and memory function, more suitable for users to use. New Practical Concept Design: The LCD screen allows users to soo clearly and intuitively even if so many gears need to be displayed. The gravity ball design breaks the tradition that it is not easy to clean the inside of the teeth with portable water flosser. Due to gravity ball, the suction pipe can pump water of the bottom of the water tank. More Optional Modes and Greater Pressure Range: Nicefeel FC1596 water flosser now has a pressure range of 10 to 125 psi and is available in 6 gears (modes 1-4, pulse mode and DIY mode). The new DIY mode can choose one of the 8 gear positions from low to high, with the memory function to meet the needs of each user.