The Sonicare HX8831 AirFloss Pro is clinically proven to be as effective as floss for gum health. Healthier gums in 14 days. Designed for inconsistent flossers. Compressed air delivers high-speed droplets to powerfully but gently clean deep between teeth using either water or your favourite mouth wash. Clean your whole mouth in 60 seconds. The HX8331 has a powerful rechargeable Lithium Ion battery and is Universal Voltage. 2-year warranty.