Speed: 1. Fill the 320ml water tank with warm water. 2. Choose your preferred mode (Normal, Pulse, DIY, Soft, or Stepless) and adjust water pressure from 60 to 200 psi. 3. Place the selected nozzle tip into the water flosser and position it at a 90-degree angle to your teeth. 4. Turn on the device and move the tip along your gum line and between teeth. 5. After use, remove the tip, rinse it under water, and store it in the provided case. 6. Clean the water tank and base after each use to prevent bacterial growth. 7. Charge the device for 3 hours before first use and every 42 days of use in soft mode.