BAKO offer two years warrenty for the products. Once the two years warrenty period expired, BAKO will charge the raw material cost for maintance. BAKO will not offer free maintance for the following circumstances: 1. Malfunction caused by misuse, including improper disassemble ,or testing and other misoperations. 2.Damage due to the user's misuse. 3.Shell damage or components damage in use. Cost for After-sales technical support BAKO will arrange engineers to help with installation and maintance guidance, the clients should bear all the cost incurred for after-sales technical service, including visa fee, boarding fee ,foods ,transportations fee and so on.