Features: 
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<br />Size: Length: 12cm/4.72inch; Width: 7.5cm/2.95inch; Height: 4.5cm/1.77inch
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<br />Buttons: 5 x buttons: Left Button, Right Button, Forward Button, Backward Button, DPI Switch Button
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<br />Rollors: 1 x Scroll Wheel
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<br />Interface: USB
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<br />Support System: Windows / Mac
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<br />Wireless Range:5-8m
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<br />Power:2 x AAA Battery