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)