Mice & Trackballs Features: 1. Super energy-saving, no light, le light design, power intelligent design, a variety of low-power mode design, save battery power. 2. Including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing. Intelligent connectivity, no need to code, plug-and play. 3. Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away. Description: Ergonomically designed, comfortable grip. Decent and modern design. Ideal laptop companion for home and office use. Specifications: Color: black, white (optional) Power: 2 x AAA battery (not included) Adjusted DPI: 1000DPI, 1200DPI, 1600DPI Operation systems: Windows 2000, Me, XP, Vista, Win 7 and Mac etc. Package Included: 1 x Mouse 1 x USB receiver Notes:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow slight dimension difference due to different manual measurement.