The PR-PRO3 Presentation Remote from Keyspan by Tripp Lite is an advanced presentation control that frees you from your keyboard during a presentation or lecture. With RF, laser, mouse and audio controls in one sleek remote, it is an ideal tool for presenters and lecturers. Capable of a range of more than 100 feet, it covers large meeting rooms and lecture halls. Its plug and play functionality makes it simple to use since there is no software to install -- just plug the receiver into the USB port on your PC or Mac and it works within seconds. Its wireless RF technology doesn't require line of sight, meaning you can walk anywhere in the room and truly engage your audience without breaking your flow. For multimedia presentations, it can control the system volume on a Mac or PC. The PR-PRO3 is compatible with all projector brands. It comes with two AAA batteries.