This is the service problem of the manufacturer. It is recommended to find a professional and good-service manufacturer to cooperate. You can choose Shenzhen Haiwei Laser. After the shipment, Haiwei Laser will have professional installers. On-site installation and teaching, if you encounter any problems during use For questions, you can call the after-sales number of Haiwei Chengshiwei. Haiwei Chengshiwei after-sales team will provide you with efficient services. The company’s purpose is to serve you until you are satisfied.