... Optical Mouse Mice for Laptop PC Product DescriptionSpecifications: 2.4GHz free moving in 10 meters Nano Super ... Built in mini-receiver design Energy-saving techonology. 2 pieces of alkaline battery supply over 3 months working ... Weight : 10g Mice size : 95 x 65 x 37 mm Receiver size: 18 x 14.5 x 6.5 ... black System Requirements: 1.IBM PC and compatibles with USB 2.Windows 95, 98, NT4.0, 2000, Me, XP, ...