WIRELESS MOUSE - Wireless 2.4 GHz ergonomic mouse especially for small hands; 10 meters operating range; Mouse Dimension: 105x67x58 mm ERGONOMIC DESIGN - Natural ergonomic vertical for right-handed people; 6-button design; Recommended to prevent or ease the pain of repetitive strain injuries (RSI) users; Designed to provide comfort during long typing hours DPI SWITCH - Optical sensor and built-in DPI switch button; You can switch DPI between 800/1200/1600 PLUG AND PLAY FEATURE - Plug and play mouse with Nano USB receiver, easy to start using with standard-setting function. Built-in power on/off switch button and power saving function. SYSTEM REQUIREMENTS - Windows 7, 8, and 10; Package includes: 1x Perimice-719 and 12-month-limited-warranty; 1x AA battery needed (Battery is not included in the package); Nano USB receiver with a storage compartment Note: If the package is missing the USB receiver, Perixx will provide a replacement receiver; make sure to insert batter