Please read carefully before buying If the product you receive has quality problems or can not be used, please don't worry, be sure to take photos or video to our customer service, customer service will re-issue a new one for you, or refund Wireless projector can be connected to the network Wired projectors cannot connect to WiFi and Internet Wired projector connection: You can connect the phone projection screen through the USB phone data cable The screen can be connected to the computer through an HDMI HD cable If you encounter problems in the use of the process, please contact our customer service, we will answer for you