Anker CB310 Full-Size Ergonomic Wireless Keyboard and Mouse Combo for Desktop with Water-Resistant and whisper-quiet Keyboard Design Designed especially for your Windows computer. Sleek keyboard profile with ergonomic palm rest. Independent multimedia keys specifically for Windows for easy and quick media control. Mouse: 3 adjustable DPI level (1000/1500/2000); 4-level energy-saving mode (minimum to 50uA) saves power however you use the mouse. (The two thumb buttons are not recognized on the Mac OS X.) 2-in-1 nano receiver unifies the mouse and keyboard connections into one USB port, keeping more ports open for other uses. Package contents: Anker 2.4G Wireless Keyboard, Anker 2.4G Wireless Mouse, USB nano receiver (pre-installed on the underside of the mouse), user manual (AA battery and AAA battery are not included)