Two-year warranty Water tank 150 ml (30 seconds use) 2 speeds 2 heads Powered by AA battery 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 With battery-powered, portable and waterproof design The Waterpik Rapid Cordless Cleaner is ideal for small spaces, travel, and use in the shower Flosser Waterpik removes up to 99.9% of plaque from treated areas Using a brush only keeps plaque and food particles inside the mouth, which can lead to gum disease, tooth decay, and bad breath. The water flosser also helps freshen breath leaving your mouth incredibly fresh and clean Comes with 2 speeds of water pressure power, on/off water button, runs on 3 AA batteries - no charging needed