ADVANCED WATER FLOSSING: Aquarius is a performance water flosser model featuring enhanced pressure with 10 settings for a custom clean, massage mode for gum stimulation, plus a built-in timer/pacer pauses briefly at 30 secs and 1 min to help track flossing time. HIGH VOLUME RESERVOIR AND SLIM HANDLE: Holds 22 ounces for 90 seconds of use, no refilling required. Small maneuverable handle makes it easy to floss all areas including back teeth and includes a convenient water on/off switch. Covered : Yes DENTIST RECOMMENDED: 9 in 10 dental professionals recommend the Waterpik brand. Waterpik is clinically proven and the first water flosser brand to earn the American Dental Association (ADA) Seal of Acceptance. KEY FEATURES: 7 tips for multiple family members and needs, 10 pressure settings (10-100 PSI), removable 22 oz reservoir (top-rack dishwasher safe for easy cleaning), 90 secs of flossing time, 360 tip rotation, 120VAC/60Hz for use in North America only. EASY AND EFFECTIVE: The Waterpik Aquarius water flosser removes up to 99.9 percent of plaque and is up to 50 percent more effective than dental floss for improving gum health. Just fill the reservoir with warm water, place the tip in your mouth, and start flossing.