Micro-precision scroll wheel: Faster, easier web navigation plus advanced optical sensor for smooth tracking on more surfaces

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Extended battery life: Go for up to three years without a battery change. Takes 2 Double A batteries.

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Compact comfort in cool colors: Ergonomic shape, soft rubber grips and great style thatu0026#39;s easy to take anywhere

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Multi-device wireless receiver: Tiny Unifying receiver connects up to six Unifying-compatible devices

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For Windows and Mac computers: Works with Windows XP, Vista, 7 and Mac OS X 10.5 or later

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