A suitable remote control is usually included, but replacement remotes are also available in many price ranges, even with displays and touchscreens. When choosing a projector or an additional control unit, make sure that all the functions you need are available. In any case, the remote should be able to do more than just turn the projector on or off. Media controls allow you to select the data source, such as a computer or TV. If you are using a network, network controls are practical.
For training purposes, remotes with an integrated laser pointer are suitable, as they also allow for automatic control of the connected laptop to navigate through the presentation.
