Small size, low noise, low dissipation, its service life is more than 500 hours. Removable liner design, easy to remove, easy to clean. A Silicone waterproof protection is adopted for the keys and the charging port, so it is safe to use and no longer afraid of damage. Soft silicone brush, comfortable and does not hurt your feet.< /p> It has variable rate artificial intelligence grade copper motor up to with long life.