INFINITER Wireless Presenter with Green Laser Pointer and Ergonomic Touch Sensor Mouse (LR-12GR) Original Designed and Made in Taiwan with a high-quality manufacturing service and outstandingly lower RMA rate than the industrial average for others made in China Work flawlessly on Mac, Windows. OS supported for Windows 7, Vista, XP, OS Mac 9.0 or later. Powered by 2 AAA batteries (INCLUDED!!) rather than the button batteries which is quite convenient and cost effective. Service time up to 6 hours. Plug-and-play 2.4 GHz wireless USB receiver device with no additional software downloads & driver installation required. Built-In docking bay stores receiver for easy pack up and portability. Full function Touch Mouse. Light (97g incl. battery) but Sturdy construction with big buttons for Page up/down, Screen black/back and Green Laser Pointer.