Lightweight cordless and easy to use, the Waterpik(R) ultra cordless dental water jet makes it easy to maintain healthier gums. You'll see results in 14 days or less! Clinically proven to be twice as effective as traditional string floss for improving gum health! Removes bacteria deep between teeth and below the gum line where brushing and traditional flossing can't reach. Proven in laboratory tests to remove 99.9% of plaque from treated areas with a 3 second application. Massages and stimulates gums to improve circulation and keep your gums strong and healthy. Leaves your mouth feeling incredibly fresh and clean. Guaranteed. Features: four unique tips. Two pressure settings. 45-75 psi. Reservoir capacity of 45 seconds+. Rechargeable. No batteries needed. Can be used with your favorite mouthwash. Two-year warranty. Includes one each: classic jet tip, tongue cleaner, plaque seeker(tm) tip, and orthodontic tip. Model WP450.