Speed: 1. Fill the 300ml reservoir with water. Ensure the base cover is closed tightly. 2. Choose the desired water pressure setting (weak, strong, or pulse) using the control button. 3. Turn on the device and aim the irrigator tip at the teeth. 4. Move the tip gently along the gum line and between teeth to remove plaque and food debris. 5. After use, empty the reservoir and clean the irrigator tip and nozzle. 6. Store the device in a dry place and recharge the battery when needed. Precautions: Do not immerse the device in water. Ensure the base cover is closed tightly to maintain waterproof integrity.