Battery operated, portable, and waterproof, the Waterpik Cordless Express Water Flosser WF-02 is designed for travel anywhere, use in the shower, or for smaller bathrooms. Tested and trusted, it is the first product in its class accepted by the American Dental Association (ADA). It provides a unique combination of water pressure and pulsations to clean deep between teeth and below the gumline, removing harmful bacteria and debris that traditional brushing and flossing can't reach. The Cordless Express is a great solution when you want the convenience of water flossing in the shower or on the go. It includes 3 AA batteries, an easy-to-fill water reservoir, and 2 water flossing tips.