KB5500W Wireless Desktop Keyboard and Optical Mouse Features: 2.4GHz Wireless Connectivity with 15 Internet/Multimedia Hot Keys and 5 Button Optical Mouse. It has Automatic Wireless Synchronization, Optical Sensing Technology. PC and Mac Compatible. Package Contents: Wireless Desktop Keyboard and Optical Mouse and Mini USB Receiver with 2 AAA Alkaline Batteries For the Keyboard and 2 AA Alkaline Batteries For the Mouse, User’s Manual and Warranty Information. Specifications: Optical 800dpi Mouse, 10 Million Strokes Per Key and USB Connector