Shenzhen Langtong United Technology Co., Ltd. is a service provider of projectors at home and abroad. If you have any questions during the use of Langtong projectors, please feel free to communicate with us. We will try our best to provide efficient product pre-sales and sales Medium and after-sales service; once there is a problem with the machine, we will reply within two hours after receiving the fault report. If it cannot be solved by telephone technical support, we will arrive at the scene within 48 hours to deal with it. We always adhere to a principle: customer satisfaction is our constant pursuit. When you choose Langtong, you choose high-quality and efficient service. All employees of Langtong look forward to long-term cooperation with you.