[Standard mode] Standard water pressure, efficient cleaning, suitable for teeth The daily cleaning. [Gentle mode] Mild water pressure for sensitive teeth Early use. [DIY mode] Manual adjustment, long press the function key to change speed Turn on the function button gently when the water pressure is appropriate. [Pulse mode] Point-to-point injection, especially for positive Monstrous user. (Stepless mode) Variable frequency water pressure, suitable for massage gums. Strong teeth.