2.4GHz wireless and Red optical technology helps you stay connected, giving you greater control when using your computerOn/off switch and smart sleep mode help your battery last longerDPI 1600 sensor technology stays sensitive to your every moveErgonomic design keeps you comfortable when you're at your desk for hoursCompatible with Windows10, 8.1, 8, 7, or Mac OS 10.4 or higherRequires 1 AA alkaline battery (not included)