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Advanced optical gaming sensor (PMW3366): Logitech's most accurate and responsive optical sensor precisely translates hand movements onscreen
Tunable weight and balance: Repositionable 3.6G weights for superior fit and feel
RGB customizable lighting: Match your style and environment with up to 16.8 million colors
$25 ($40-$15 Promo Code: 83448) https://www.amazon.com/gp/product...UTF8&psc=1