For example, a short movie clip outlining a procedure or an audio segment describing a process can be a very interesting addition. Video and audio from a videocassette can also be added. An overhead-projector LCD uses the light of an overhead projector to transfer images from your laptop onto a screen for viewing. The laptop is connected by cable to the LCD, which is a flat screen that sits on top of the overhead projector. Images are then projected onto a large screen by the overhead projector.
Some versions project fewer colors or are less bright than others.
A slide recorder is a good investment for groups or departments that make several slide presentations each year. You then send the film out to be developed, or you can use instant slide film for quicker turnaround. Many medical school graphics departments have slide recorders and make them available to others. When only an overhead projector is available, color transparencies can greatly enhance your presentation. Splashes of color can be used to highlight important points and help maintain the interest of the audience.