Hello, thank you for your support and attention to the products of Little Genius. During the validity period of the three guarantees, the user must issue a purchase invoice and a valid three-guarantee certificate to enjoy the three-guarantee rights; If the valid invoice and three-guarantee certificate are lost, and it is impossible to provide a copy of the valid invoice and three-guarantee certificate, the start date of the warranty period shall be extended by 90 days according to the production date of the host computer, and one-year warranty service shall be provided.