SANOXY 2.4ghz wifi Foldable Folding Arc Optical Mouse for Microsoft Notebook Technical Specifications: DPI: 1600 Interface Type: USB Application: Desktop, Ergonomic Design, High Accuracy High Quality, Modern Design. Wi-Fi Range:1m Tracking Method: Optical Type: 2.4Ghz wifi Hand Orientation: Both Hands Optical Resolution: 1600 DPI Buttons: Left button, right button, rolling wheel Compatible with windows and Mac Os. Operation systems: Windows 98, 2000, ME, XP, Vista, Win 7 and later Power: 1 x AA battery not included Item size: 98 53 18mm Approx. USB dongle size: 18 14 6mm Approx