2.4 GHz wireless communication, effective within 9 meters, with strong anti-interference capabilities. More convenient keyboard and mouse integration for faster operation. Optical sensor trackball controller for precise, frequent, and accurate positioning. Flat and comfortable button design. Multi-language support. Scroll technology with random rotation between two directions. Intelligent power indicator. Easy to carry for travel or home HTPC and computer applications. Ultra-thin design, multimedia keys, fixed-point trackball, comfortable and reliable, simple structure. Features a classic key layout with 78 keys, 20 multimedia keys, and a built-in trackball mouse with up to 1000 DPI resolution. The left and right mouse buttons are located on the top of the keyboard for easy user access. For added convenience on the desktop, the bottom right corner of the keyboard also includes left, right, and scroll wheel buttons. Product Parameters: Connection: 2.4G Wireless Size: 26 x 12 x 2.5 cm Product Weight: 210g Weight After Packaging: 300g Mouse DPI: 1200 Tracking Method: Mouse tracking ball Power Supply: 2 AA batteries Color: Black Button Lifespan: 8 million times System Requirements: Windows 2000, Me, XP, Vista, Win 7, Linux, Android, and Mac or higher.