With ergonomic design, this wireless mouse allows you to enjoy convenient and comfortable typing experience. The bottom right corner of the keyboard has the mouse left and right keys and scroll wheel, which can be randomly turned between two directions. It is constructed of plastic material. The length of the product is 26cm, the width is 12cm and the height is 2.5cm. The product supports for Windows 2000, Me, XP, for Vista, for Win 7, for Linux, for Android and for Mac or higher. Item Name: Keyboard Material: Plastic Number of Keys: 78 Keys Backlight Function: Support Backlight Dividing Rate: 1200DPI Operating Distance: 10 Meters Use Battery: 2 x AA Batteries (Not Included) System Systems: for Windows 2000, Me, XP, for Vista, for Win 7, for Linux, for Android and for Mac or highe Features: Ergonomic, Multifunctional, Backlight Function Size Details: 26cm x 12cm x 2.5cm/10.24" x 4.72" x 0.98" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Keyboard 1 x User Manual