Wireless presenter features a bright green laser pointer to ensure it's easy to see on any presentation screen, even in a brightly lit room. Easy-to-use operation combines functions of page up, page down, play slides and quick black screen for more control during your presentation. Vibration function provides a convenient reminder to help you keep track of time. LCD timer and battery-power indicator prevent unexpected runout. Volume buttons provide a simple way to adjust your audio as needed. Auto shutoff when the receiver is stored in presenter ensures efficient operation. Presenter requires two AAA batteries (sold separately).