Plug & Play Super Easy to Use -- Truly plug & play design, no driver needs to be installed. 2.4GHz wireless transmission technology provides a powerful and reliable connection up to 33 feet Portable Size & Noiseless Mouse - Portable design makes it easy to store in your bag for traveling, responsive buttons provide a very smooth click with less noise, no longer disturbing others with the loud clicking sound 4. Only 1 AA battery is required - It only takes 1 AA battery to operate this mouse, and the wireless mouse will enter sleep mode within 10 minutes of inactivity for saving power, can be easily activated by clicking any button 5. PC mouse with universal compatibility - works perfectly for Windows XP, Windows Vista, Windows 7, Mac OS X 10.4 etc. ?Note: This mouse is connected by a USB receiver, it will not be compatible with MacBook Pro or other devices that only have mouse ports.