Command Wire

Generally a remote control (remote control) is wired, and uses an infrared transmitter. There are situations where it is not as practical: large rooms where the speaker is 35 feet or more from the projector. Rear projection, where the screen lets in a signal, but usually has a lot presented below. Also, the presenter has to point to the projector which often means moving away from the audience. A pair of projectors that offer wireless controls that can accept a cable at the rear of the projector, ensuring that the range and signal to be received properly.

High Gain screen: A screen that uses one of many methods to collect light and reflect it back to the audience, while dramatically increases the brightness of a picture on the wall white or color. The technologies used include curved screens, special metal screens (some polarized), and grain-glass screens. In terms of price and performance vary widely.