About this item Enduring Quality & Power Saving - High DPI Movement resolution allows the mouse to track on nearly any surface. Rated to 5 million comfortable clicks. Turn into sleep mode in 8 minutes of inactivity for energy saving, easily activated by clicking any button. 1 AA Battery (NOT Included) is needed for this mouse. 2.4GHz Stable Wireless Connection - A tiny wireless receiver (stored in back of the mouse) provides stronger anti-interference ability, faster transmission speed and more reliable connection up to 15m (49 feet), without any hassle of additional wire and driver. Just plug and play. Portable and Noiseless - Stow the USB receiver inside the wireless mouse when not in use. Take it to anywhere like home, office, coffee shop, etc. Responsive buttons provide soft click with less noise. Ergonomic Shape & Impressive Color - Slim ergonomic design and smooth sleek surface for an incredible user experience. Special gradient yellow to red make your desk more vivid and colorful. Save you from long time dull work. Wide Compatibility - Work with Windows XP, Windows Vista, Windows 7 , Mac OS X 10.4 etc. NOTE: This product is connected by USB receiver, and is NOT compatible with macbook pro or other laptops which don't come with USB ports.