Can projectors be used in rural areas where there is no network in mountainous areas?
Yes, the projector projects the picture of the input source, which is the interface. When you connect a computer and a set-top box, you will project images (TV programs) onto the desktop of the computer and the set-top box. So you don't need a network, you can use it, and some projectors are wireless, and you can also connect them wirelessly without wiring, as long as there is a power supply.