Technical Specifications Built-in slideshow buttons 50-foot effective range with 2.4 GHz wireless technology Red laser pointer with LED indicator Plug-and-play， no software required Storable receiver and carrying case Battery-power indicator On/Off switchSystem Requirements Windows-based compute Windows® XP or Windows Vista®， Windows® 7 & Windows 8 & Windows 8.1 USB portComplete Package Contents Wireless Presenter R400(battery not included) Wireless USB receiver Manuals