Panasonic Oral Irrigator Jet Washer Doltz Ultrasonic Water Flow Waterproof Cordless White EW-DJ55-W (1 piece) Promotes gum health in about 3 days with "ultrasonic water flow" (*Water flow that generates ultrasonic waves due to the shock wave when bubbles burst*) (*Only when using the ultrasonic nozzle*) (*Verified at water pressure level 10. According to our research. Usage effects vary depending on conditions.*) [Type] Handheld / Cordless / Waterproof / Ultrasonic Water Flow [Water Flow] Ultrasonic Water Flow [Tank Capacity] Approximately 200mL [Continuous Usage Time per Water Refill] Approximately 1 minute (Water pressure level is maximum setting & ultrasonic water flow nozzle)