Features: The patented barber noise reduction design is adopted, which has lower noise and is not easy to heat. Titanium fixed knife + nano ceramic moving knife has high hardness and smoother surface,R-shaped fillet treatment ensures safety and comfort in hairdressing. The slider type positioning comb design can lock the haircut length range of 3-21mm. It can be pushed gently when changing the length. It can be used for more than 80 minutes after 1 hour fast charging. Suitable for all people, adults, children, men and women.