With the high speed PANASONIC EW1270AC Portable Irrigator your mouth can feel clean and refreshed anywhere, anytime. Strengthens gums by massaging gumlines with just the right amount of pressure Folds down to nearly half its original size for easy cleaning and carrying Fits easily into your bag and packs away without any messy cords or awkward tanks, so you can take the irrigator wherever you go! Power Source - 3V DC or 2 1.5V alkaline batteries (not included) Dimensions (Tank Open) - 8.9H x 1.8W x 2.5D Dimensions (Tank Close) - 5.9H x 1.8W x 2.5D Weight - 7.4 ounces (without batteries)