Wireless charging: Charging time is less than 90 minutes, and a full charge can be used for more than 1 week, which is truly energy-saving and environmentally friendly. AI automatic save function: Save the user's habitual mode, and it will automatically start from the last used mode when it was last used. Blue light whitening: Automatically turn on the blue light when brushing your teeth to sterilize and disinfect the oral cavity, effectively remove tartar and plaque, and make the oral cavity fresh and healthy. IPX7 waterproof: Adopts IPX7 waterproof sealing design, which is sturdy and durable and easy to carry. Just press and hold the button for 3 seconds, the blue light will automatically light up, and the sonic motor will start working immediately. You can switch modes cyclically (press the button to switch (4 levels)) In any mode, press and hold the button for 3 seconds to turn it off.