2. 300ml water tank---Enough for one-time use for most people.
3. Higher capacity lithium battery---2500mAh
4. Low frequency with higher water volume---Not harmful or breeding to teeth gum after adaptive phase
5. Five pressure modes---More choices for personal use.
6. Overheat protection
7. IPX7 waterproof ---Water pump/Motor and Circuit Board/Battery are in separate room
8. Seven types of nozzles for option.
9. Gravity ball patented design---For using upside down and cleaning teeth inside
10. Detachable water tank
11. Waterproof design for charging port