• EASY & EFFECTIVE: The Waterpik Water Flosser is the easy and most effective way to floss, removing up to 99.9 percent of plaque from treated areas and is up to 50 percent more effective than dental floss for improving gum health; Perfect for braces, implants, and other dental work
• TESTED & TRUSTED: Waterpik is clinically proven and the only water flosser brand to earn the American Dental Association (ADA) Seal of Acceptance. Enjoy healthier gums and brighter teeth in just 1 minute a day
• ADVANCED CORDLESS DESIGN: Enjoy the convenience of cordless water flossing and a waterproof design for use in the shower. Includes 5 pressure & speed settings ranging from 30 to 110 PSI for a custom clean, plus ultra-quiet operation
• RAPID MAGNETIC CHARGING: Convenient charger connects magnetically to the unit and charges in 5 hours; LED battery indicator lets you know when it’s time to recharge. Working Time of Fully Charged: 12 Days (Work Twice Each day) Or Continuous Work 80 Minutes.
• GREAT FOR TRAVEL: Cordless Advanced is portable and global voltage compatible 100 240vac, 60/50hz; It includes a travel bag and tip storage case plus 4 accessory tips for multiple users and needs.

Warning: if the water tank is empty, do not turn on the device.

Here is a Video to help you understand how it works