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nAdvanced 2.4GHz wireless connectivity provides fast data transmission and virtually no delays or dropoutsFull-size contoured design with soft rubber grips Plug-and-forget USB nano-receiver eliminates worries over lost receivers12-month battery life with battery indicator lightSmooth responsive tracking and effortless scrolling Compatible with Windows 7 Vista XP and Mac OS x 10.4 or laterSilverIncludes Nano-receiver and 1 AA battery