COMPUTER_COMPONENT - This mouse is very convenient to carry around, no matter you are at home, at work, or at travel. The USB wireless receiver is included and is attached perfectly on the bottom part of the mouse. - Powered by: 2 x AAA battery (NOT included) . Elegant and ergonomic design, perfect to match your laptop or PC . - Brand New and high quality. 2.4G Wireless Optical Mouse. 3D optical mouse, left/right button and scroll wheel. - Compatible with PC, Mac, windows XP, vista, win 7, and win 8. - High speed: 800dpi to 1600dpi, use the small 'DPI' button to switch the speed between 800dpi and 1600dpi.