Details 2.4G Wireless Mouse For Computer office 7-Button Ergonomic Design Rechargeable Vertical Mouse healthy 2400 Dpi long battery life Features - 1 - 2.4GHz Wireless Connectivity (USB receiver & rechargeable mouse usb cable included) 2 - Built in rechargeable battery(600MA) 3 - Ergonomic designed to remit and prevent carpal tunnel syndrome. 4 - Optical laser technology for precise control 5 - Easy to use; comfortable to hold; prevent mouse hand. 6 - L/R mouse buttons; 2 thumb buttons; and a clickable scroll wheel ; 2 dpi buttons(dpi +/dpi -). 7 - You pick the hand position that best suits you. Plug and play; compatible with Mac. Specifications - 1 - Item type - Ergonomic Optical Mouse 2 - Resolution - 800dpi;1600dpi;2400dpi. 3 - Button - 4 buttons and 1 wheel (middle button)and 2 dpi (Adjustable ) 4 - Maximum operating range - 10m 5 - Charging cable Length - 80 cm 6 - Color - Black+Red 7 - Material - ABS 8 - Button life - 5 million times 9 - System Requirements - Windows 98/Me/2000/X