Specifications: 3 buttons, including scroll wheel, left button, and right button. Ergonomic and ultra-slim design for comfortable grip. 2.4GHz wireless mouse with USB receiver for easy connection. Intelligent wireless control, no coding required, plug and play. Item Name: Wireless Mouse Material: ABS Button Number: 3 Buttons Operation Range: 10m Wireless Transmission Frequency: 2.4GHz DPI: 1000DPI Power Supply: 2 x AAA Batteries (Not Included) Supported Systems: Windows 98/XP/Vista/7/8 Features: Flexible, 3 Buttons, Plug and Play, 1000DPI, Wireless Length: 8cm (Approx.) Width: 5cm (Approx.) Height: 1.5cm (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 Wireless Mouse (without Battery)