If you give a lot of presentations, then a wireless presenter will give you the freedom to move around as you talk. The transmitter plugs into your USB port, and you carry the controller in your hand. The controller has convenient buttons which allow you to flip through slides in a Power Point presentation. Cheap wireless presenters will cost you just a few dollars. But if you're willing to spend a little more, the best wireless presenters have extra features. For example, some have built-in laser pointers to help you bring attention to specific areas of your slide.