PRODUCT DESCRIPTION:If you have ever struggled with juggling a laser pointer， a mouse， and more to give a presentation， you'll appreciate the thoughtful design of this wireless trackball presenter. It features 7 buttons， two switches， and a laser pointer. Still， it's easy to use and installs on your PC by itself: just plug in! The USB receiver comes with an extension cable for better reception. Working distance: approx. 40' or 12 meters. Functions include left & right click; open Internet Explorer， Outlook， or My Computer; Page up/down; alt/tab/escape; and close the active window. The three top buttons have icons in red & black: switch between the "red" or "black" mode with the switch on the left side.TECHNICAL SPECIFICATIONS:Control the pace of your presentation easily. The controlling distance is up to 10 meter / 30 feet away.Multifunctional presenter: functions as a laser pointer， an optical mouse and keyboard etc.Easy to use: It is USB plug-and-play. No driver required.Save power design: The device will go to sleep mode if there is no operation for about 30 seconds.Package Contents: 1 x Transmitter， 1 x USB Receiver， 1 x USB Cable， 1 x English User Manual