The Wireless Presenter R400、  is designed to help you make your point in a meeting. It：s got a red laser   pointer、 is easy to see against most backgrounds and projection surfaces、 you can be sure they won'tmiss the point. Its intuitive slideshow controls help you navigate through your presentation with confidence. Features?1. Built-in slideshow buttons. 2. Contoured one-touch keys for easy slideshow control.3. Lightweight、 portable、 comfortable handheld feeling.3. Plud and play、 no software required、 makes it simple to get started.4. Red laser pointer with LED indicator、 is easy to see against most backgrounds and projection surfaces.5. Storable receiver 、easy to use、 simply insert the receiver to USB port and it can be used immediately6. Battery-power indicator、 make you understand the power's situation.7. On\off switch、 can extend the battery lifetime.Specifications:1.Color: Black2. Effective Range: Approx. 50-foot(15-meter)3. Battery: 2AAA batterier(Not include)4.  2.4 GHz wireless technology.5. USB port6. System Requirements: Windows XP、 Windows Vista、 or Windows 7Package include 1 x Wireless Presenter Remote Control R4001 x  Wireless Mini Receiver