Promotes gum health in about 3 days with "ultrasonic water flow" (*ultrasonic waves are generated by the shock waves when bubbles burst*). (*Only when using the ultrasonic nozzle*). (*Verified at water pressure level 10. Our research. Use effects vary depending on conditions.*) [Type] Handy / Cordless / Waterproof / Ultrasonic Water Flow [Water Flow] Ultrasonic Water Flow [Tank Capacity] Approximately 200mL [Continuous Usage Time per Water Refill] Approximately 1 minute (at maximum water pressure setting & ultrasonic water flow nozzle)