Within 15 days from the date of receiving the product, the customer has the right to request the return and replacement of the main engine in case of functional obstacle caused by improper use, modification or installation error, and the normal use function cannot be restored through technical maintenance within 15 days after the customer receives the product.

No return or replacement is allowed under the following circumstances:

1. Products with wrong selection by customers or damaged products due to improper use, modification or installation by customers.

2. Products damaged by the transportation company designated by the customer, or products damaged in the process of customer return.

3. According to the requirements of customers, customized, modified and added specific words, signs and other products.

4. In case of non functional failure of the main engine (damage of accessories, etc.), repair or replace the accessories according to the damage, and do not handle the return and replacement of the whole machine temporarily.