Promotes gum health in about 3 days with "ultrasonic water flow" (*Water flow that generates ultrasonic waves through the shock waves produced when bubbles burst*) (*Only when using the ultrasonic nozzle*) (*Verified at water pressure level 10. Based on our research. Usage effects vary depending on conditions.*) 【Type】Handheld / Cordless / Waterproof / Ultrasonic Water Flow 【Water Flow】Ultrasonic Water Flow 【Tank Capacity】Approx. 200mL 【Continuous Usage Time per Fill】Approx. 1 minute (Water pressure level set to maximum & ultrasonic water flow nozzle)