2.4GHz wireless and Red optical technology helps you stay connected, giving you greater control when using your computer On/off switch and smart sleep mode help your battery last longer DPI 1600 sensor technology stays sensitive to your every move Ergonomic design keeps you comfortable when you're at your desk for hours Compatible with Windows 10, 8.1, 8, 7, or Mac OS 10.4 or higher Requires 1 AA alkaline battery (not included)