Battery operated and waterproof, the Waterpik Cordless Express water flosser is perfect for smaller bathrooms and travel, or when you want the convenience of water flossing in the shower. It combines water pressure with pulsating action for an exceptional cleaning, removing harmful bacteria and debris that traditional brushing and flossing can't reach. This lightweight, portable water flosser comes with 2 classic handheld flossing tips, a water on/off slider switch with 2 pressure settings, 3 replaceable AA batteries, and an easy-to-fill, removable 5-ounce water reservoir with up to 30 seconds of flossing time. The Waterpik Cordless Express water flosser removes up to 99.9% of plaque bacteria that causes gingivitis, cavities, and bad breath from treated areas and is clinically proven up to 2X as effective as string floss for removing bacterial plaque and improving gum health. Waterpik is the #1 water flosser brand recommended by dental professionals, and the Waterpik Cordless Express water flosser is accepted by the American Dental Association (ADA) for safety and effectiveness. Backed by a 1-year manufacturer's limited warranty, see product manual for details.